Fuel Pump Only Primes

i just don't get why the pump won't prime. Fuel filter not sealed good, fuel filter double o ringed because the old one was left behind on the housing. Truck has 55,000 miles and about 2200 hrs. Offers the full flow and rock steady fuel pressure that only a dynamic, Aeromotive bypass regulator provides. MAGNAFUEL PRODUCTS INC. 97 12V HARD TO START LOSING FUEL PRIME. The fuel system of a Cummins 5. It is mounted on the front of the hump of the truck, so about 12"+ above the fuel tank outlet. Smell for fuel. The blocking vanes are pressed against the pump rotor by spring pressure. Damage and poor performance caused by cavitation. Without it there will no fuel available to start it. We read 5 volts on the purple wire to the fuel level and nothing on the gray wire (12 volt power). It can also be relatively difficult to prime the fuel system once air has been introduced into the system, such as when the fuel filter is changed. Fuel line doesn't seem to be the problem though. 7) Carter Only. There should be a prime switch located on the fuel pump line. If you are getting 12vlts, then go ahead and disconnect the fuel line close of the fuel pump, Check the pressure coming out of it right at the fuel pump outlet, (connect a hose to a bucket so you don't spill it out. That is terminal #5 and feeds the load (fuel pump). Does anyone know if the fuel pump turns on when you turn the key to "on" (aka the vents, and other electronics begin to run)? Sometimes I get a stumbly startup but it's rare. Assuming the fuel filter has been replaced, I would suspect the fuel pump is weak. ( 2000 Savana cargo van 2500 5. Read to know when it's time to change. I've got the charger on the battery, getting 13v out of it right now, so there's plenty of juice. As many ATV and UTV users have discovered, dealership fuel pump replacements are cost prohibitive and many times include unnecessary components. This means the fuel pump is only powered on when the engine is cranking or running. now fuel pump dont prime no more,at all. The fuel pumps are weak, fuel lines go bad, the fuel select valves go bad, and your carburetors are 15+ years old, and probably have never been rebuilt. 3 v dc this voltage is not enough to activate the relay what could be the course: August 14, 2016. fuel Injected Regulators. Mechanical fuel pumps: This type of pump is common on older vehicles that have a carburetor. Fuel Injected. Nothing Pressurized fuel tank sprayed soap water on lines. Have been following the threads about the 03 Fuel Pump becoming a problem. It does not get power again during that key cycle until the engine is firing (as detected by an accelerating crankshaft sensor signal). Operate fuel supply pump primer lever (B) until fuel flow is free from air bubbles. This is one of the more common fuel pump problems found in classic cars that are between 30 and 60 years old. If the pressure drops then the pump has to prime the system to bring the pressure. Energize the fuel pump relay and power the fuel pump circuit. It's only a slip connection over the outgoing fuel line and my be the cause of the pressure bleed down. imperfections, otherwise the pump will not operate satisfactorily or may not operate at all. o Not priming properly o Noisy fuel pump o Fuel pump sounds like it is turning 'ON' & 'OFF' Add fuel to a 5 gallon bucket. Those pumps were sold with names such as Dupree, Autopluse, AC, Stewart Warner, and Walbro. When residual oil pressure drops below approximately 7psi, the contacts in the oil pressure switch open and fuel pump shuts off. Some pumps are sealed and cannot be repaired; check to see if there are screws for. The swish of the fuel into the chamber is less. DAVCO Technology is the industry leader in Diesel Fuel Filtration for off and on-highway diesel engines. If the fuse is blown, it will be broken or burned. No Start, with no smoke. Check the relay socket for the ONLY terminal that faces differently from the other three. The FR700VN is a 115V AC pump only. BLEEDING AIR FROM DIESEL FUEL LINES AND FILTERS Farm Machinery Fact Sheet FM-01 By Dr. I installed an electric fuel pump in my 52, but only as a priming pump(the line likes to drain back when sitting for several days) and rely on the stock mechanical otherwise. Is there a low pressure pump in the fuel tank which primes the system prior to the high pressure pump supplying the common rail. The FR604G is a 115V AC Pump only. According to the fsm you pull the fuel pump fuse and start the car until it dies to relief all fuel pressure. The fuel pump is inside the tank, right? So the one connector going to the bottom of the tank is the fuel pump connector?. Shopping for Fuel Pumps & Tanks, Fuel Injection Pumps, Fuel Pump Components, Fuel Pump Electronics, Fuel Pump Hardware and more? Save on everything you need -- shop at Advance Auto Parts! Buy online, pick up in-store in 30 minutes. Fix your fuel pump problems with our repair guides, how-to’s and diagnostics here! Our technical articles will break down how your F-150's fuel system functions and how to handle big ticket repair items yourself. Replaced the relay box (got one on ebay) and still does same thing. Basically my car was working fine then after sitting over night my car won't start (again, same problem) I'm basically thinking could a bad Fuel Pump Relay cause my car to start sometimes? When i try to start it the fuel pump doesn't prime so it. Second version of the myth:. o There are only 2 factors that can affect the units' performance while running the test. Place assembly upside-down on bench. If you don't hear this sound but the engine cranks when you try to start it, you may have a problem in the fuel pump electrical circuit. now fuel pump dont prime no more,at all. I got into the habit of cranking a second, backing off to prime the fuel system and resume cranking. Remove the jumper from the FP and Gnd terminals of the diagnostic connector. Then make sure that the pump is delivering fuel. Bad Fuel Pump Relay Symptoms. The fuel pump normal only runs while the motor is running or cranking over, so a dry gas line takes a long time "cranking" to prime the pump and line all the way to the carbs. is fine the way it sits. I didn't bother to refill the fuel filter tank either. Sometimes the pump will require manual re-priming after the initial prime. Continue to step 2. You always want to wire a pump through a relay," Baker advises. Symptoms of BAD Fuel Pump. Place rubber insulator on inlet of pump. Water pump failures for Duramax engine are somewhat common. Here are step-by-step instructions for changing a fuel filter. The fuel pumps are weak, fuel lines go bad, the fuel select valves go bad, and your carburetors are 15+ years old, and probably have never been rebuilt. Page 1: How to test a BAD Fuel Pump. So my question is, can a problem in crank sensor cause fuel pump failure? or is it pure coincidence?. Hopefully the mechanic is certified and has experience. A fuel pump delivering less fuel than needed will cause the driver to experience hesitation, bucking, or. This won't fix your problem but it will save you a lot of time diagnosing the problem. The time the fuel pump stays running after the ignition has been turned off is the same time as the fuel pump primes when the ignition is turned on. long story short I ran out of fuel less than ten feet from pump,engine died,coasted to pump,put in fuel and now it wont start. So if you turn the key on and walk back there, you will see no power. So, you can easily find the perfect fuel pump for your specific make and model. There's a Fuel Pump Test point under the hood, passenger side, in the harness just above the PCM. I turn the key to the on position but the fuel pump only primes for 1 split second then cuts off. Water Pump Failure. A pump designed specifically for diesel fuel should be used only for diesel fuel. single stage pumps; double stage pumps. Fuel filter not sealed good, fuel filter double o ringed because the old one was left behind on the housing. Problem #1 - Dirty Fuel. A complete pump failure will result in a non-running engine. We did another tutorial last month regarding golf cart fuel pump problems, but we had a special case in the shop a few days ago and thought it might be worth a follow-up. John Deere 4010 Roosa Masters injector pump problems I removed the fuel supply line to the top of the injector pump crank tractor then stop bubbles come out the. The 46-Comfort module would trigger the electric fuel pump prime, providing that system is operating properly and the LF door latch is OK, so you may have a long crank or start/stall after sitting for an extended time frame if that isn't happening. 2 ways of testing the Fuel Pump. He was wrong. The pump then gets rid of the air and moves water only, just like a standard centrifugal pump. only downfall is if relay does go bad. The most common cause of the fuel system not holding pressure up to the injectors is the fuel pump inside the fuel tank. Shop Lift Pumps for the GM Duramax 6. Top right wire is correct I assume. Comments: i have a 2005 E46 318i that could not start, i suspected the fuel pump but when i bridged the fuel pump relay the fuel pump worked, the problem is with the fuel pump relay on terminal 85 and 86 there is only 8. This problem is caused when the fuel pump can't deliver a smooth flow of fuel to the engine; periodically, your engine receives only air when it was expecting to receive fuel. Talking to the repair guy said it was the fuel pump. Losen the supply pipe from the pump to the rail. single stage pumps; double stage pumps. Then suspect bad fuse or pump. This pic shows the hose disconnected from the white hose barb, so the pump just hung off the two wires. It is a direct line to the fuel pump, bypassing the fuse & relay. Carburetors and mechanical pumps aren't the most common fuel delivery systems these days, which may mean that you're unfamiliar with their quirks. First, Check how many volts you have at the fuel pump, I know you rewired it, But just to rule out the problem. Get complete property information, maps, street view, schools, walk score and more. Walbro's Series 6000 pumps offer exceptional performance in a variety of demanding applications. Have you guys any suggestions? Daz 2004 RSVR grey and silver beauty. An outboard motor priming bulb temporally installed in the fuel line works also. Fuel system with any kind of oil being used in the fuel. So the procedure I use is: change filter, operate prime pump for about 10 secs, start engine. It's easy to take your car's fuel pump for granted, until you have a problem. FACET SOLID STATE ELECTRIC FUEL PUMPS These pumps measure less than 3inch in any direction and weigh only 18 oz. Let’s take a look at 4 common fuel injector pump complications. Stop by your local AutoZone and ask our staff how you can benefit from a new fuel pump or order online. Thinking maybe if I let the fuel pump "prime" that it could alleviate this issue. If your having a problem getting fuel to the pump your going to have to prime the system as suggested. Justincredible, Aug 30, 2012 #13. but once i got it started it kept enough pressure to. Even the best electric fuel pumps on the market aren’t very forgiving of poor installation practices. Remember the pump will only run for about 2 seconds initially when you turn the key on. You can also check out our Fuel Pump Replacement PDF for more guidance in replacing this small. Easily find what you need from 1,610,259 parts available. It is also long-lasting, with no internal rubber parts or bellows to wear out. ~It is worth inspecting this and replacing if it is blocked. Toyota fuel pumps usually only fail when vehicle has been sitting for long time not being used hence fuel pump seizes from rust. This is one of the more common fuel pump problems found in classic cars that are between 30 and 60 years old. I didn't bother to refill the fuel filter tank either. Operate fuel supply pump primer lever (B) until fuel flow is free from air bubbles. test fuel pump 2007 tuono, fuel pump on my aprilia tuono w, aprilia tuono petrol not going into engine, rsv miLlechryd fuel pump not priming, aprilia rsv millie petrol pomp, aprilia sxv 550 where is the fuel pump fuse, fuel pump for 2000 aprilla rsv mille, aprilia rsv mille fuel pump, rsv mille fuel pump not priming, rsv mille turns over but. When you turn on the vehicle, the pump sends fuel under pressure to the injectors, to "prime" or have fuel present to be able to start engine. The return is also located in the tank, hence only one line. I assume it's either the prime pump or the filter housing that is bad. Any help would be greatly appreciated. Top right wire is correct I assume. So, if the consumer is told that only the original equipment filter will not void the warranty, he. Read the instructions on the new fuel pump and make sure it is wired correctly, it is the fuel pump replacement for your year and make of truck. the fuel pump ONLY runs when the starter button is depressed or the engine is running. What Causes Low Pressure in a Fuel Pump? The fuel pump takes the fuel from the tank and delivers it to the carburetor or fuel injection system at the required pressure. They are effective only up to a certain distance and height with respect to the fuel tank level because the. The fuel pumps are weak, fuel lines go bad, the fuel select valves go bad, and your carburetors are 15+ years old, and probably have never been rebuilt. I have an 88 5. Foxboy Mustangs utilize a return fuel system, so there is no need to worry about the fuel pump sending too much, as whatever is not needed will simply be sent back to the tank via a return-line. Fuel Primer Pump - A manual pump to add a small amount of fuel at the cylinder intakes to assist in starting a cold engine. Replaced it turned key forward relays clicked and fuel pump primed. My electric pump hasn't worked for over a year. When residual oil pressure drops below approximately 7psi, the contacts in the oil pressure switch open and fuel pump shuts off. For some reason, my fuel pump primes like it should, but once it shuts off, it never comes back on when I crank the engine. It is located under the upper plastic plenum on the intake manifold. With the IP fuel inlet screw removed I pumped, and pumped, and pumped on the manual priming pump; I can get solid fuel flow, but only after pumping a LOT of air out, and as soon as I stop pumping for 30 seconds or so, and start pumping again, I get mostly air coming out of that line. The 2001 to 2004 LB7 fuel filter housings seem to be the most prone to problems. Includes a 7. Both relays are energized from the 12v ignition wire that used to go to the + side of the coil. The main component of the fuel pump is the diaphragm. Thanks for the reply. Bad Fuel Pump Relay Symptoms. only when i leave it over night it will get the air leak in the fuel if i stop for a few hours and the car starts fine. The time the fuel pump stays running after the ignition has been turned off is the same time as the fuel pump primes when the ignition is turned on. Even the best electric fuel pumps on the market aren’t very forgiving of poor installation practices. Average power output is 70% of the prime power rating. Shop 34 DC Powered Fuel Pumps at Northern Tool + Equipment. Fortunately, a little common sense goes a long way in maximizing pump reliability. I didn't bother to refill the fuel filter tank either. From these two things, a host of problems can surface. THIS is what the carburetor looks like before removing the cover. I first had a fuel leak in the metal line running in front of engine from left to right side from injector pump to filters. All good advice so far, the prime wire is normally red or black with a connector on the end of it, it breaks out of the main harness about six inches from the fuse relay center. Remove the jumper from the FP and Gnd terminals of the diagnostic connector. If you are not sure you could hear it or if there is noise outside; you may have to try it several times. These fuel pumps are electric powered. The choke is not needed if the engine is properly primed. Or you need to replace the prime pump. Losen the supply pipe from the pump to the rail. It is important to understand that self-priming pumps cannot operate without water in the casing. Several years ago my battery would randomly die over night. Most common fuel pump diagnostic procedures in the past could be performed with a press ure gauge and a volt meter. Often, it's not the pump itself that fails to function, but the power that supplies it. If there IS a fuel solenoid valve that is not working or the needle valve is stuck closed, that will prevent the fuel pump from purging the air out of itself to prime(why I suggested disconnecting the hose in my last post). I had no voltage when I checked for 12V on on the fuel pump harness when key is turned. At Pismo this weekend my wifes LTZ400 died in the dunes. But the pump doesn't prime or do anything. Im trying to troubleshoot a no start problem after rebuilding my engine, I want to clarify that the fuel pump should prime when the key is first turned on without actually cranking the engine. Hook a tester to the fuel pump ground and check for continuity to pin 108 on the ECU connector. Also the BOSCH L-Jetronic Fuel Injection Systems Fuel System is designed to "hold" Fuel Pressure (usually at about 36 PSI) when the engine is turned off. Remove the fuel pump from the engine shroud or off of the tractor itself and take the fuel pump apart on a work bench. We did another tutorial last month regarding golf cart fuel pump problems, but we had a special case in the shop a few days ago and thought it might be worth a follow-up. It is located at the back of the vehicle next to or in the fuel tank. Modify the times given in. Fuel pump "whine" is a loose term. Today, the most important tool is the scan tool. To Planocat, I "hot wired" the electric fuel pump to prime the carburetor and the Generator started fine and ran well and produced all the energy I need for several hours. 3L engine or 41 to 47 psi if it is a 2. Boat was still stalling intermittently on dock. Pressure Relief Valve 18. The battery is only a month old, also it has been working fine all week as I've been using back and forth to work everyday. The auto industry leader in fuel delivery products, Airtex covers more than 250 million vehicles in operation today with their fuel pumps and assemblies for cars, trucks, fleet, and specialty vehicles. I'm thinking a fuel pump. Results for "fuel pump" Select a vehicle * The VIN decoder is provided as a convenience only; there is no warranty or guarantee of accuracy regarding the same. So I can only assume that the carb. replaces the old system. Shopping for Fuel Pumps & Tanks, Fuel Injection Pumps, Fuel Pump Components, Fuel Pump Electronics, Fuel Pump Hardware and more? Save on everything you need -- shop at Advance Auto Parts! Buy online, pick up in-store in 30 minutes. Edelbrock Fuel System components covers a wide range of products for your fuel management needs, from injectors, complete fuel line kits to gauges and more! Edelbrock. Hey guys, Ive been driving my Volvo 850 Turbo for a while now. Wait a couple of hours, it will start, run a couple of seconds, die again. The length of hose must not be greater than 7metres which is the maximum suction height for the pump. Ten gallons of diesel in tank. Shop Lift Pumps for the GM Duramax 6. Caused by improper angle of fuel pump, pump must be 15 – 35 degree angle up with the outlet / harness connection being on the high side. From now on whenever you start the car, pause in the run position before cranking it over. Talking to the repair guy said it was the fuel pump. You should hear a whirring sound coming from inside the fuel tank for about two seconds. The reason I ask is that for ever, mine would only run after the starter was cranked. 11-27-10 09:37 AM - Post# 2010083 In response to someotherguy People often come here looking for help because their truck won't start. The fuel pump is the old rotary style and it has the input from the lift pump on one side and a return fitting plumed into the injectors on the opposite side. It cannot be repaired, only replaced. The fuel must travel through a hose, also called the fuel line, and it is the job of the fuel pump to make sure the gas reaches the proper location. Read the instructions on the new fuel pump and make sure it is wired correctly, it is the fuel pump replacement for your year and make of truck. I turn the key to the on position but the fuel pump only primes for 1 split second then cuts off. Different fuel pump manufacturers rate their fuel pumps in different ways. The ability for self-priming pumps to prime hinges on all the right conditions. I'm just still confused why there is no power for about two minutes after I put in the jumper and then the fuel pump kicks in and buzzes. 9 steps for testing a snowmobile fuel pump Discover the step-by-step process for testing your snowmobile's fuel pump, and ensure yourself the best ride possible. It took a while to trouble shoot, but, I finally found that the Fuel Pump Oil Pressure Switch had a slight short in it. One of the early warning signs of a bad fuel pump is the development of a high pitched sound when the engine is first engaged. If pump doesn’t prime then you know its not filter related. Easy to wire in and NO REGULATOR needed. Then make sure that the pump is delivering fuel. Relay is good checked several times pump does not prime however provides pressure when cranking ecm comes on energizes relay after some time tinkering I decided to look for a grounded fuel pump. It points to all of that stuff between the car's power system and the pump - relays, wiring, switches and such. An important note: GM is not alone in using the basic design I'm about to discuss. The pump must be able to evacuate air from inside the pump, create a low pressure area at the eye of the impeller, and also be properly sized for the right NPSH conditions. Fuel systems with fuel-injection do not tend to lose prime due to fuel evaporation. Performing the ‘5 Gallon Bucket Test’ simply isolates the unit. These pumps are designed for light oil pumping applications such as diesel fuel, biodiesel and kerosene. o Not priming properly o Noisy fuel pump o Fuel pump sounds like it is turning ‘ON’ & ‘OFF’ Add fuel to a 5 gallon bucket. Here are step-by-step instructions for changing a fuel filter. A fuel pump is a frequently (but not always) essential component on a car or other internal combustion engined device. All good advice so far, the prime wire is normally red or black with a connector on the end of it, it breaks out of the main harness about six inches from the fuse relay center. TEST 2: Spraying Starting Fluid (Fuel Pump Quick Test). Pressure Relief Valve 18. The most common symptoms of lift pump failure are slightly harder starting and low power. Time limit – This technique is only good for about (5) minutes because the fuel will evaporate and the prime will be lost. 6) Locate the OEM electrical connectors. A fuel pump A fuel pump controller (electrical black box) Here’s how things work. 5 amp circuit breaker. Fuel injected engines do not have this control. I got into the habit of cranking a second, backing off to prime the fuel system and resume cranking. could the output on the PCM be Bad? or could there be another problem? I don't want to replace the PCM until I'm that is the problem. I only see 1 relay in the fuse box under the hood, I change it out to the horn relay still the pump wont turn on. V6 mercs are set up with electric fuel pumps all the time. came out with the old pump. This article only addresses liquid self-priming centrifugal pumps. I fire it up and it only runs of the prime. Typical peak demand is 100% of the prime rated ekW with 10% overload capability for emergency use for a maximum of 1 hour in 12. I do not think it was mentioned, but you really want a self priming pump. Our Mikuni fuel pump is simple, easy to install and operates off the the pulse created by the engine. Cummins PT Fuel Pump Diagnostic. To solve this issue myself, I installed a Edelbrock electric fuel pump at the rear of the car. The fuel pump does not prime like it's supposed to when I switch the ignition to oN. Do not disconnect fuel lines between the high pressure fuel pump and nozzles. now fuel pump dont prime no more,at all. If you are looking for a single fuel transfer pump or multiple diesel fuel transfer pumps you have come to the right place. Many engines (older motorcycle engines in particular) do not require any fuel pump at all, requiring only gravity to feed fuel from the fuel tank or under high pressure to the fuel injection system. The fuel pump is the old rotary style and it has the input from the lift pump on one side and a return fitting plumed into the injectors on the opposite side. One last piece of advice: when a selecting a fuel pump, it is always better to go with a quality, known brand. So, if the consumer is told that only the original equipment filter will not void the warranty, he. i used a motor cycle jack to lower my tank, worked perfect. Have been following the threads about the 03 Fuel Pump becoming a problem. Connect a fuel tank filled with a 50-to-1 mix of gasoline and outboard motor oil -- 2. Prime fuel pump. This primes the fuel pump pressure that may have leaked off, but does not run the pump. Part 2 more detailed causes. Then started testing the relay harness and it all checks out, ran through the 2 pages of harness checking and all is fine. Fuel pump "whine" is a loose term. The stock lever pumps just wouldn't put out enough for 3 quads. Others vary the fuel pump's power supply to control its output and therefore pressure, usually with feedback from a fuel-rail pressure sensor. When checking for power it will only be hot for 2 seconds in the "RUN" position. I've got the charger on the battery, getting 13v out of it right now, so there's plenty of juice. You don't want the fuel pump to be running if the engine isn't turning over as that creates a fire hazard should you be in a crash. but this air leak would only happen once a month thats why i only suspected the fuel filter as i had driven 50 miles on sunday after the priming the pump and the car running fine. i used a motor cycle jack to lower my tank, worked perfect. Thanks for the input, I'll remove it if the problem arises again. BLEEDING AIR FROM DIESEL FUEL LINES AND FILTERS Farm Machinery Fact Sheet FM-01 By Dr. The battery is only a month old, also it has been working fine all week as I've been using back and forth to work everyday. (Black with red stripe). 7L GM with the Spider Fuel Injector Assembly. In the position shown, the normal position, the pump is connected to the ignition-switched power. Assuming the fuel filter has been replaced, I would suspect the fuel pump is weak. Do not over prime the engine. Fuel pump will make normal noise (whine), but certain whines are not normal and mean problems. Since you replaced the fuel pump, that is the only other part of the fuel system that would release pressure. The first is a fuel heater which engages when fuel temperatures fall below about 60ºF. Different fuel pump manufacturers rate their fuel pumps in different ways. Shop 34 DC Powered Fuel Pumps at Northern Tool + Equipment. I only have one line coming off the back of the. • Capable of regulating any fuel pump between 100 and 250 GPH. It can last the life of your vehicle, but only if it's properly cared for. If you wonder whether or not you have a bad fuel pump, here are a few signs that it is time to get a replacement. 3; Fuel pump loosing prime/failure to hold fuel in line. DAVCO Technology is the industry leader in Diesel Fuel Filtration for off and on-highway diesel engines. but once i got it started it kept enough pressure to. ) We also supply new Electric Fuel Pumps and are developing services for firewall-mounted Vacuum Tanks. It's more likely to be the relay than the fuel pump. I have 12v at the fuel pump fuse just never any voltage at the pump. Cranks but does not Start. The time the fuel pump stays running after the ignition has been turned off is the same time as the fuel pump primes when the ignition is turned on. It points to all of that stuff between the car's power system and the pump - relays, wiring, switches and such. Fuel Transfer Pumps - Pressure and Flow Rate. So, you can easily find the perfect fuel pump for your specific make and model. In the position shown, the normal position, the pump is connected to the ignition-switched power. Sign-up not successful. By there's a good chance that the cause of this distressing no-start condition is an electric fuel pump that's no longer capable of forcing fuel forward with. #2 The neutral light does not come on when the bike is in neutral. I have replace my faulty mechanical lift pump with an electric pump so my fuel system bleeds well without a 'squeeze' bulb, and the injector pump is well primed before the engine even rotates, giving near instant starting. There are many reasons a rebuilt fuel pump assembly is better than buying a new one through Victory: We’ve been rebuilding fuel pump assemblies for many years now and have improved processes and products that exceed OEM spec. It is a back up to the fuel pump relay. When I was a kid, the only way we could get our hot rods to run was with electric fuel pumps. Some models may vary by serial number. Car will not start but will start on either. This article is number one in a six part series on the Cummins fuel system (1994 to 1998 equipped with the P pump). A complete pump failure will result in a non-running engine. power to the relay is constant. There should be at least 10 psi fuel pressure on the fuel. FACET SOLID STATE ELECTRIC FUEL PUMPS These pumps measure less than 3inch in any direction and weigh only 18 oz. o This test is referred to often throughout this manual. Carb'ed yams with electric fuel pumps usually have a fuel filter after the pump. The ability for self-priming pumps to prime hinges on all the right conditions. Since you replaced the fuel pump, that is the only other part of the fuel system that would release pressure. Fuel injected engines do not have this control. 3L and had a voltage problem as well. We read 5 volts on the purple wire to the fuel level and nothing on the gray wire (12 volt power). Remove the fuel pump from the engine shroud or off of the tractor itself and take the fuel pump apart on a work bench. The fuel pump is the old rotary style and it has the input from the lift pump on one side and a return fitting plumed into the injectors on the opposite side. Some pumps are sealed and cannot be repaired; check to see if there are screws for. In this test step, we're gonna' jumper two wires (numbers 3 and 4) together to manually get the fuel pump to activate. In the morning when I try starting it, it will fire and idle for what seems like less than a second then dies. As I said earlier, I replaced all the fuel lines because they were old and I was going underneath anyway!. That's just how the fuel pump control logic works and this is fairly standard across all engine management systems. They prime the filter and fuel system with a flip of the switch. This is not a litmus test for an operational fuel pump but, like many of the tests here, will give you a clue. I have replace my faulty mechanical lift pump with an electric pump so my fuel system bleeds well without a 'squeeze' bulb, and the injector pump is well primed before the engine even rotates, giving near instant starting. I have a fuel pump (SU) problem with the car. Although it's not absolutely necessary, you should connect a fuel pressure gauge to the Schrader Valve (on the fuel injector fuel rail), so that when you jumper the fuel pump to power, you can check that the fuel pressure the fuel pump is outputting is enough to start your.