Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
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Does the fuel pressure leak down key on engine off or with the key off??
What is it at with the engine at idle? Is it t 47 psi? Does it go up a bit when you step on the gas pedal?
I am sorry, I see you that you indicated this in your initial post.
May I get your VIN?
Can I get the complete VIN?
I am sorry but the image did not come through..
Thank you for the VIN!
It is very important that the fuel pressure is within specs on this engine.
Key on engine off and while cranking the fuel pressure NEEDS to be between 60 and 66 psi. Hands down
Because we have a low fuel pressure issue when the engine is running, there is something that needs to be addressed. Was the fuel filter replaced? Was power at the fuel pump checked? What about the ground to the fuel pump? If that all checks out good and there are no restrictions in the fuel pressure line and nothing is leaking fuel causing this low fuel pressure, you have a faulty new fuel pump and it will need to be replaced under warranty.
No sir, your last two replies are not correct.
Just because the pump runs does not mean it has a good ground.
No, a pinched fuel pressure line will cause low fuel pressure.
If the old lines are restricted in anyway, yes, they can cause this. I have found that the most common place for the lines to be pinched is the rubber part where it goes up to the throttle body (before the throttle body)
No there is a no common place that it goes bad, but I would recommend to check the ground strap from the tank to the frame. Just follow the black wire from the fuel pump module and it will go to a ground and you can remove it, clean it up and re attach it.
Another test you can do is to dead head the fuel pump (restrict the return line) with the engine at idle and the fuel pressure should reach 70 psi.
Would you be willing to speak on the phone? I have sent over an offer with my phone number in it..
To be honest, I think the offer may expire after some time. When it does, I am not able to send another offer over again. So I would recommend that you accept the offer now before it expires..
You dont have to be at your truck when we talk. But I understand you may not be able to talk at work.
You can always accept my offer not and then call me later when it is convenient for you..
Hello and sorry for the delay!
As far as the fuel pressure issue? No, we have covered everything. As long as nothing in the fuel system is leaking and the pressure line is not restricted and the power and ground check out good, the problem is a bad fuel pump.
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