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Tool Hut
Tool Hut, ASE Certified Technician
Category: Chevy
Satisfied Customers: 494
Experience:  Owner of a mobile diagnostics company assisting auto technicians with difficult vehicles
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My name is ***** *****. I have some problem with my van,

Customer Question

Customer: Hi, my name is ***** *****. I have some problem with my van, it's a 2006 express 2500HD duramax
JA: Thanks. Can you give me any more details about your issue?
Customer: I think I have a bad fuel pressure relive valve. I turn the key on, the lift pump is working. but it pump all the fuel back from the return live to fuel tank
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Submitted: 11 months ago.
Category: Chevy
Customer: replied 11 months ago.
Hey, is anyone there
Expert:  Tool Hut replied 11 months ago.

Hi, My Name is ***** ***** for posting your question to just answer. I am a ASE Certified Master Auto Technician with 20 years experience. I am confident we can resolve your problem together.Please remember I don't know your skill level. I can't see, smell, hear, or touch the vehicle. It may take a few back and forth replies to get to a satisfactory resolution.I also try to give all of the information you may need expecting a positive rating.

What kind of problem are you having?

Expert:  Tool Hut replied 11 months ago.

The lift pump will pump fuel back to the tank after the system is primed.

Customer: replied 11 months ago.
My problem start with the van just stopped running at one day. I changed two fuel filter. And the lift pump somehow won't turn on. I hot wire the relay to kick it on, and get the van running. But it has a code P0087 and won't go over certain rpm.
Customer: replied 11 months ago.
But as soon as I take out the wire and plug the relay back in, the lift pump will stop working. Now I somehow get the lift pump working without hot wire it, but the system lost prime, and difficult to prime it.The van won't run
Customer: replied 11 months ago.
I unplug the fitting to two injector, and crank. I can see some air came out. but not much fuel
Expert:  Tool Hut replied 11 months ago.

DO you have a scan tool that you can monitor fuel pressure?

Customer: replied 11 months ago.
no I don't
Customer: replied 11 months ago.
I only have a scanner.
Expert:  Tool Hut replied 11 months ago.

What kind of scanner? It does not show fuel pressure?

Customer: replied 11 months ago.
It's the basic kind. It does have live data. Let me try to see if it has the fuel pressure data. But just now, I cranked some more, nothing came out of the injector fitting when the lift pump is running and pumping fuel back in to the tank from the return line.
Expert:  Tool Hut replied 11 months ago.

you may in fact have a pressure relief valve problem. Seeing fuel pressure would help assure that is the problem

Customer: replied 11 months ago.
It does have the fuel pressure data
I have no fuel trail pressure at all. 0.71MPA
It desires 50+Mpa
Customer: replied 11 months ago.
But I wasn't sure if I choose the right engine. I choose the LLY engine.
Customer: replied 11 months ago.
how many pressure relief vale do I have, only one on the driver side of the fuel trail or on both side? And I see the fuel go pass the relief vale to a hose then to the return line. Can I just clamp the hose shut to see if I can build up some pressure?
Customer: replied 11 months ago.
But if the valve is bad, can it be that bad that not holding any pressure at all?
Expert:  Tool Hut replied 11 months ago.

You have 1 relief valve. Yes it could be bad enough to keep from starting. Yes you can pinch off line and see if that helps. Do not leave clamped for long.

Expert:  Tool Hut replied 11 months ago.

It has been a couple of days since I have heard from you. Do you still need assistance? I have also noticed that I have not received a rating from you. If for some reason you question did not get answered please reply. I am only compensated for my time when you leave a positive rating. Your understanding is appreciated.

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