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My 95 yukon 5.7 liter,my truck will start after ive tried once everytime so not fuel pump, problem is the fuel pump doesnt do a prime wen i turn ignition on

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  • Cars & Trucks Master
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Either the pump relay is not working right, or the check valve in the pump is letting fuel drain back into the tank when you turn the engine off.
You would check the pump relay to see if it is getting a ground signal from the computer when you first turn the key on, then look at base fuel pressure with a gauge if necessary.

Posted on Jan 19, 2013

6 Suggested Answers

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Posted on Jan 02, 2017

  • 53 Answers

SOURCE: I have an 2001 Yukon 5.3 liter and about to do

IF U HAVE A BAD FUEL PUMP OR A FUEL
FILTER BUT THE FUEL PUMP BAD BECAUSE OF THE FILTER MORE THAN LIKELY SO I WOULD REPLACE BOTH IF THE PRESSURE IS NOT BETWEEN 45 PSI AND 55 PSI. GOOD LUCK CHEAPEST PLACE FOR A PUMP AND FILTER IS ADVANCE AUTO PARTS JUST REPLACED THE ONE IN MY TAHOE.

Posted on Sep 02, 2009

carputers
  • 255 Answers

SOURCE: I have a 97 Dodge Avenger ES 2.5 liter which does

the regulator is bad or clogged fuel screen or just leaking/loosing fuel prime. try to key it up a few times to build prime before starting. no matter u need to replace the pump if its not holding 55psi at the fuel rail.

Posted on Oct 22, 2009

Testimonial: "Thanks for your reply. I was leaning toward replacing the fuel pump as well so thank you for the added assurance. Will try this now. Thanks! Diane"

emissionwiz
  • 75822 Answers

SOURCE: truck starts but won't stay running

You may have a problem with the contacts in the ignition switch (not key part), when you crank the engine a signal is sent to the fuel pump to run, when it starts and you let off the key another set of contacts keeps the pump getting power Through a relay), these are known as crank and run modes.

Posted on Aug 04, 2008

honeymokey
  • 3113 Answers

SOURCE: 1998 gmc 2500 wont keep running

The anti thieft system is keeping it from running.

Posted on Dec 13, 2009

alicantecoli
  • 22156 Answers

SOURCE: 97 chevy 1/2 ton 5.7 vortec truck won't start

remove the shroud around the steering lock ,then with a meter locate the feed ,then the 12v when ignition turned on then with a suitable paperclip or piece of wire turn the igniition on and then from the 12v supply apply a supply the other connection for the starter motor and try that ,if it starts ok then renew the ignition switch ,if it doesnt start its the electronics

Posted on Dec 27, 2009

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1 Answer

I have to prime fuel pump before I start the engine. What can cause this. Brand new fuel pump. 1999 GM yukon


how do you prime an electric fuel pump thats buried inside a fuel tank ---are you getting fuel to the throttle body --is pump turning on --retest pump new doesnt mean free from defects if this is the first replacement pump for vehicle was the connection to pump upgraded /changed out [problem with connection corrosion and damage would incur causing pump failure or non operation of pump ]also check lines are not kinked and pump installed correctly

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Try turning the key to the right about 5 times,but don't start,that will prime the pump,

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I replaced a fuel injector on my 95 Cavalier and now it wont run


Use a gage and check proper fuel pressure, 41--47 psi, key on engine off. Cycling the key on and off a few times before you crank it, should prime the system.
Check for fuel injector pulse, use a noid lite, engine cranking. The voltage for fuel injector probably goes hot with the key on. The computer grounds the fuel injector circuit. The diagram is for 2.2L engine. The pink wire for fuel injectors is voltage, the bottom wire is ground. We've talked about the fuel system, could be other issues?

fuel injectors-mbl3q30razq005ehaxtcof2q-5-0.jpg

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1 Answer

My yukon will not start in the morning you wont here the fuel pump prime. but it will start in the evening once it gets warm is that the fuel pump


Replace the fuel pump relay. If that does not solve your problem the fuel pump needs replacing. On a 14 year old vehicle if the fuel pump has never been replaced it is not a surprise it is going bad.

Mar 19, 2011 | 1997 GMC Yukon

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Im working on a 95 s10 blazer.It has the 4.3 engine.It will only start if it is sprayed with starting fluid.the fuel pump,fuel filter,and pressure regulator have all been replaced.Seems like the system...


It sounds like the fuel pump is not working. Perhaps the install was not completed correctly. Things to check, fuel pump relay, wiring, voltage to the pump.
The priming happens as soon as you put the key in and turn it to "acc" (you may hear a humming sound). Then once you turn it to "start" the injectors and spark plugs start firing.
Another possibility is that the fuel filter was installed backwards.

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2003 yukon 5.3 ran outa gas put some in now wont start?/??


Good chance that the fuse may have blew and needs to be replaced. If the fuse is still good, the bad news is the fuel pump may have burnt it self out and will need to be replaced. The fuel it self is what keeps the fuel pump cooled and keeps it from burning it self up. Good luck and start with the simple and check the fuse. Good luck and keep me posted.

Jan 25, 2010 | 2003 GMC Yukon

3 Answers

99 yukon 180,000 mi. doesn't start. cranks forever, but won't start. Should I be able to hear the fuel pump when I turn on the key?


yes you should be able to hear the fuel pump run for about 5 seconds once the key is turned to the on pos. check to make sure you have spark. if you do try having someone spray air intake or carb cleaner into intake manifold while you crank. If the truck starts right up for a second (or stays running as you keep spraying) Id say you have a bad fuel pump and id change the sending unit also. (First check the fuel pump fuse and fuel pump relay) GMC and Chevy are nororiously known for having bad fuel pump/sending unit problems. I have prob changed over 60 myself.

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1 Answer

I have a 97 Dodge Avenger ES 2.5 liter which does not seem to be getting fuel. The fuel pump primes when it is turned on but it will not start. Any ideas?


the regulator is bad or clogged fuel screen or just leaking/loosing fuel prime. try to key it up a few times to build prime before starting. no matter u need to replace the pump if its not holding 55psi at the fuel rail.

Oct 22, 2009 | 1997 Dodge Avenger

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