Question about 1997 GMC Suburban

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My suburban has to be primed to start

Will start and run if you prime it and will restart unless it sits for a while

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  • GMC Master
  • 4,134 Answers

There is a separate circuit and relay that primes the fuel system when you start the vehicle. If you sit in a silent location and turn the key to the ON position (without cranking), you should hear the fuel pump run for about 5-6 seconds. This is to bring the fuel pressure up in order to let the vehicle start. Then the normal pump circuit takes over. Sounds like your priming circuit is not working. I would try the relay first.

Posted on Dec 25, 2014

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Posted on Jan 02, 2017

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  • 1 Answer

SOURCE: 97 GMC Sonoma

checked fuses , #9 fuse for fuel pump was loose.

Posted on Jun 22, 2008

Papa Chan
  • 56 Answers

SOURCE: 2003 GMC Duramax Diesel won't start

I see that you had the injectors replaced 20,000 miles ago. I would still check the oil to make sure it is not overfull. The new injectors could be bad. If the oil level is not overfull then get a paper towel and touch the dip stick tip on the paper towel while oil is on the dip stick. If it's only oil it will not spread. If it has diesel in the oil the oil with spread. If this test doesn't show the injectors to be bad then you have three other possibilities. The FICM (fuel injection control module), the fuel pressure regulator, or the injection pump. It's hard to pinpoint what the problem is without running more tests and the only way to run those tests is with the computer the dealership has. Just so you know your injectors are still under warranty until 100,000 miles. Most likely you will have to take it to the dealership to get you truck fixed. I hope this helps you some.

Posted on Jan 05, 2009

  • 8 Answers

SOURCE: Cranks, fuel pump is running,

My 1996 4x4 had the same problem. It was my fuel pressure regulator. $800 later...from the dealer and it starts just fine. I suggest that you pay a dealer to just scan it. That is how mine was found.

I hope this helps.

Posted on Feb 03, 2009

  • 371 Answers

SOURCE: Have a 98 gmc 5.7 truck have to prime to start truck.

Sounds to me like either your pressure regulator is bad or you have a loose fitting somewhere in the fuel line from the fuel pump to the engine. When you turn your key to the on position, you should hear the whine of the fuel pump until it builds pressure. When you shut the truck off the pressure regulator should retain the pressure for a certain amount of time but if it don't close then air is allowed into the fuel line and the fuel drains down to fuel line away from the engine. Next time you try and start the truck after it has sat for a while try turning the key on until you hear the fuel pump whine shut off, then repeat it 3-5 times and then try to start it. Basically that is running the pump enough to get the fuel back up to the injectors. Check for loose fittings in the fuel line, or cracks in the fuel line and if all that is fine then replace the regulator.

Hope that helps

Posted on Oct 03, 2009

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alicantecoli
  • 22219 Answers

SOURCE: 96 Chevy suburban 5.7 not getting fuel. We'll not

auto choke device defective

Posted on Aug 17, 2010

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1 Answer

Car has been sitting up and will not start now. It seems to not be getting gas and I do not know how to prime a fuel injection system. Any help appreciated.


There is only a few cars fitted with an ancient petrol injection system that needed any priming.

Diesel engines mostly need the injection system priming but petrol injection systems do not.

Lots of cars use a system where the fuel pump runs for a couple of seconds when the ignition is switched on and that is all the time it takes to prime the fuel system. After a couple of seconds the fuel pump switches off and waits to restart when the engine is cranked.

As priming the system takes only a couple of seconds some manufacturers don't bother with the brief priming run of the pump and just have the pump start when cranking.

Could be faulty supply, fuse, pump relay or the pump itself.
If the car is fitted with an immobiliser, perhaps that is the problem.

May 07, 2016 | 1998 Mercury Mystique

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2001 Hyundai accent wouldn't start this morning after sitting two days prime and no codes kept screwing with it I primed and runs then only primes sometimes but still runs great miss chug


Hi Miss Chug:
I'd start by using some carb/injector cleaner and make sure that the fuel delivery system is working properly.
If this is a carb type engine, make sure the automatic choke is not sticking.

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Has it been sitting up all winter? If so, you might need to drain fuel from the carb and replace the filter. It sounds like a fuel problem to me.

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Why will my 1998 chevrolet cheyenne not start unless primed after sitting overnight


by primed are you supplying a fuel source if so then the car is not getting fuel to burn. this indicates your fuel pump is bad and needs replacing and change the fuel filter also. the reason the pump won`t work sitting overnight is that the pump can`t build up enough pressure possibly because the fuel pressure is not being held, but after the first start up the system can maintain enough pressure to start through out the day. you can have the fuel pressure and volume checked with a gage when the problem occours to verify.

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I have a 96 S-10 Blazer, Does not want to start


Replace the fuel filter to help the fuel pump, but it sounds like the fuel pump check valve has gone bad and your losing your fuel pressure to start the engine. Your going to have to keep priming the fuel system by turning the ignition key to the run position for 5 seconds 3 times before you try to start the engine. The only fix for this is to replace the fuel pump, and that is costly. Good luck and take note: the fuel pump has a life time of around 150,000 miles and anything past that is borrowed time.

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There is a check valve in the fuel pump that sounds like it may have gone bad. Check the fuel pressure at the shredder valve, there should be 60 to 65psi during the prime and will drop 5 psi when the engine is running. Once the fuel line is primed, check to see how fast you lose your prime. Since you replaced your injection system, we can eliminate the fuel pressure regulator leaking which was common on the injection system your truck run's on. If the fuel pressure drops fast then it's going to be a bad check valve at the fuel pump and it may be time to replace the fuel pump it self. Good luck and hope this helps. Note: do not try to start the engine with putting gas through the throttle body, it's been know for small fires to start and burn the spider injectors. 

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defective fuel pump the check valve is allowing it to lose prime replace fuel pump.

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