Question about 2002 GMC Yukon Denali

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Denali won't start on the first try. Then when you try again and let it crank for a few seconds it starts and runs fine. It has 90k and I changed the fuel filter and after I check the fuel pressure, it was 51psi. Also I put it on the computer and all seems fine. Any help would be great, thanks.

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Check with advance auto store and ask if 51 is proper, thinking it should be 65 or better

Posted on Oct 16, 2010

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My 96 yukon wil not start. Sounds like it will crank over but won't. It is not the fuel. I changed the ignition coil still won't start.


try spraying some carb cleaner into a vaccum hose and see if it will run. If so then you have ignition but no fuel delivery. If not then you have an ignition problem. make sure you hear the fuel pump hum when you turn the key to the run position. It should run for +/- 5 seconds then shut off. remove gas cap and listen for fuel pump operation through the fill hole. If you can hear the pump then you have a fuel injection issue. If the engine starts and runs for a few seconds then shuts off then you can suspect the crank or cam position sensor. The fuel pump runs through the oil pressure switch which could also be an issue.

Are you able to start the truck with application of the gas pedal?

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1 Answer

98 Chevy blazer won't start up but will crank ,,


Try giving it a shot of starting fluid. You don't say if it's actually firing. If it tries or runs for a few seconds off of the starting fluid then try changing the fuel pump relay. It's inside of the glove box on the left hand side behind the little door. If that doesn't work it's most likely the fuel pump.

Jul 21, 2011 | 1998 Chevrolet Blazer

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Starts and runs for a few seconds


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Apr 21, 2011 | 2002 GMC Yukon Denali

1 Answer

Takes multiple times to start


I think you have a faling fuel pump or a bad pressure regulator allowing fuel pressure to bleed down when the engine is off.
Try this test - When you start the car for the first time of the day, turn the key to "ON", wait a few seconds, turn the key off. Wait about 15 seconds, turn the key to "ON" again, wait a few seconds. Then wait one final time for 1 seconds and try starting the car. If it starts right away, that means fule pressure is bleeding of due to a bad check vavle int he fuel pump, a bad fuel pump or a bad pressure regulator.

The reason for the procedure is because when you turn the key to "ON", the fuel pump runs for 2 seconds and then shuts off if the engine is not running. The 15 seconds wait is for the power and fuel pump relay to cycle off before it will run the pump again.

Let us know how the test comes out. The fuel pump is in the fuel tank and hums when it is running.

Mar 01, 2009 | 1999 Chevrolet Silverado 1500

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