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2004 Sierra, cranks, no start

sierra0404

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sierra0404 Enthusiast

sierra0404

Posted
Posted

Hello, I have a 2004 gmc sierra with the 5.3 it cranks over but won't start random didn't wanna start one day. I drove it came home added sea foam in to the vacuum line off the brake booster it fired up then stalled out and won't start now? Any ideas?

txab Senior Enthusiast

txab

Posted
Posted

You added seafoam while the engine was not running?

 

For your initial problem, I'd look into the fuel pump pressure and flow. Check for any stored codes?

sierra0404 Enthusiast

sierra0404

Posted
  • Author
Posted

I know the fuel pump is kicking on and ya I added it with motor off. Ive done it a thousand time to my old 01 blazer never had a problem. This is the second time adding it to my sierra

sierra0404 Enthusiast

sierra0404

Posted
  • Author
Posted

Whats the easiest way to check fuel pump pressure and flow? The truck has 166,000 miles and most likely the pump is stock and so is the fuel filter. I find it weird tho for the truck to start for like 30 seconds after the sitting for 20 mins after I added the sea foam.

govener71 Enthusiast

govener71

Posted
Posted

Maybe the pump can build the pressure but just can't keep up when the truck is started? Sort of like pulling the fuel pump relay and the truck continues to run for several seconds.

oldscsc Enthusiast

oldscsc

Posted
Posted

So should I try pulling the pump relay and see what happens? Like switch it with another?

No. If the fuel pump is running, the relay is doing its job. You need to check the fuel pressure by attaching a guage to the Schrader valve on the fuel rail. Both key on, engine off and key on, engine running.

govener71 Enthusiast

govener71

Posted
Posted

Yup. If the pump runs and kicks off it builds sufficent pressure to start the truck. How ever it may not be able to keep up with the demand of the running engine. If you find out there is too low of pressure you know it's somewhere between the fuel pump and the motor.

govener71 Enthusiast

govener71

Posted
Posted

You could try swapping the relay for another one in your round fuse box to just check it, but rarely do they go bad.

Dockellen Enthusiast

Dockellen

Posted
Posted

i just had a problem like this a week agao. i was driving and the truck shut down. it ended up being the fuel pump control module was corroded. the dealership said they have seen it before. it is mounted somewhere above the spare tire. It wouldnt hurt to take a look at it and check the condition.

txab Senior Enthusiast

txab

Posted
Posted

Ok the fuel pump kicks on like primes itself

You knew that in post #3. Does it have correct pressure and flow? Pressure/flow too low and it will not run. Have you checked for spark?

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