LB7: duramax swap to 86 chevy.. lift pump issue fuel not returning??

d-max joe

Member
Feb 6, 2009
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0
16
baltimore,md
I have a leak below alternater and seems like fuel is not returning cause you can hear it loading up on pump. I dknt underatand. Went from kennedy dieael to airdog 150.
 

JoshH

Daggum farm truck
Staff member
Vendor/Sponsor
Feb 14, 2007
13,749
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Texas!!!
What motor did you put in it? If it is an LB7 or LLY, it could be the FICM leaking. Hook a gauge up to see what kind of pressure you are getting. If it is too high, that could be why you have the leak.