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FIX IT MAN, Master Technician
Category: GMC
Satisfied Customers: 17346
Experience:  Master Automotive Technician
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GMC 04 sierra 6.6 turbo diesel: 04 sierra 6.6 diesel turbo

Customer Question

04 sierra 6.6 diesel turbo will not run unless starting fluid is sprayed into intake.then only runs for a second.
Submitted: 2 years ago.
Category: GMC
Customer: replied 2 years ago.
I have replaced the fuel filter and both batteries.
Expert:  FIX IT MAN replied 2 years ago.
Hello, my name is Bobby. Thanks for the question. Can you tell me if the fuel primer pumps up on the filter housing?
Customer: replied 2 years ago.
thank you for responding Bobby, yes it does.
Customer: replied 2 years ago.
I can push the primer button about 20 times until it becomes too hard to push down witch is what I was told to do by the dealership because when the outside air temp. is over 100, I could start the engine, but it would die after about 10 are so seconds. now it will not start without the starting fluid.
Customer: replied 2 years ago.
sorry but the starting fluid made it run for about 1 to 3 seconds
Expert:  FIX IT MAN replied 2 years ago.
Thank you. If it only starts with starting fluid but does not remain running then the high pressure pump may have failed or more commonly it is caused by a failure in the fuel relief valve in the fuel rail. These will warp and get stuck open and cause this. Do you have a scan tool that reads engine data?