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Username Post: 95 5.7 Tbi Suburban runs bad
Shepherd 
Frequent Contributor
Posts: 2065

Loc: Lake George, NY
Reg: 11-11-15
01-11-20 01:59 PM - Post#2784191    
    In response to 95tbisuburban5.7

Under load the fp should increase to about 13psi, not drop, clogged fuel filter, bad fuel pump, or pressure regulator in the throttle body. BTW welcome to CT. Try to pinch off the return line, may not be able to if all metal. If the pressure does not go up, pump is bad.

Edited by Shepherd on 01-11-20 02:01 PM. Reason for edit: No reason given.
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