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LB7 duramax diesel fuel leak

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1.6K views 2 replies 3 participants last post by  SJTEX  
#1 ·
Fuel leak on 2004 GMC LB7 Duramax diesel passenger side. Replaced the fuel filter. Pump filter housing & WIF sensor and both fuel lines from the pump filter housing to the EDU. Still leaking fuel under full throttle above 65 or under a load while pulling my fifth wheel up any hill. I have fuel all over the battery and fuel pump on passenger rear side of the motor.
I usually am able to figure out my problems. Truck has 230,000 miles on it and the injectors were replaced around 160,000 miles. Any help would be appreciated.
 
#2 ·
Welcome aboard.
 
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#3 ·
I'm new to the board here ,My friend has this truck. Have you checked the fuel line that runs through the FICM Module to cool it. My friend said that's where he found a leak one time. I'm going by what he told me I don't own a LB7. I worked on other diesels in the military. Thought I would throw that info out there because leaks happen where you never expect.

Good Luck
 
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