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John, Master A.S.E Automotive technician
Category: Chevy
Satisfied Customers: 9176
Experience:  A.S.E MasterTechnician A1-A8 w/L1,38 years experience General Motors Master Technician
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My duramax diesel truck just stopped running..highway..fuel filter

Customer Question

my duramax diesel truck just stopped running after making a turn off of the highway on a secondary street. I changed the fuel filter and primed the air out but it will not start.
Submitted: 3 years ago.
Category: Chevy
Expert:  John replied 3 years ago.

Hello & Welcome to JA,

 

Check the fuses in the under hood electrical center. I have seen several that blow the FICM (fuel injection control module) fuse.

Customer: replied 3 years ago.
Is that fuse listed under "ficm" on the table of cover?
Expert:  John replied 3 years ago.
Yes, I suggest you check all of them for voltage at both sides of the fuse.
Customer: replied 3 years ago.
i dont see that particular fuse?
Expert:  John replied 3 years ago.
Fuse marked EDU. But I say again, check all of them.
Customer: replied 3 years ago.
I checked the edu, but it seems to be okay! One more question, What is the likelyhood that it could be the fuel pump and are there ways of checking it?
Expert:  John replied 3 years ago.

The 6.6 Duramax only uses a fuel pump if there are 2 tanks & this is used to balance the fuel in the aux. tank. The fuel injection pump uses vacuum to draw the fuel out of the tank. Go to the fuel filter under the hood & push the prime bulb about 10-15 times & then try & start .If it starts you have lost vacuum in the fuel line or have an air leak.

 

If the fuel system will not even briefly prime to 10 psi and will not start, the check valve in the fuel filter/heater element housing is stuck open.

John, Master A.S.E Automotive technician
Category: Chevy
Satisfied Customers: 9176
Experience: A.S.E MasterTechnician A1-A8 w/L1,38 years experience General Motors Master Technician
John and 2 other Chevy Specialists are ready to help you
Customer: replied 3 years ago.
I will accept this answer for now because I want you to get paid, but I am assuming that i am pressing the prime bulb without loosening the plug that lets the air out? I may have a question about the fuel filter/heater element housing.
Expert:  John replied 3 years ago.

Ok,press the bulb about 10 -15 times & open the bleeder to see if any air comes out. Press the bulb again about 10-15 times & see if the vehicle will start.

If air comes out ,there is an air leak in the fuel system,if you have not recently had it open.

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