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Chevy/GMC Duramax 01-04 LB7 Discussion of Chevy and GMC Trucks with LB7 Duramax Turbo Diesel Engines

fass makes p0089

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Old 01-21-2011, 12:25 PM
jdcanvas's Avatar
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Default fass makes p0089
put fass on 01 duramax.with pump running get p0089.turn pump off runs fine with no code.Do I have to high of fule pressure ?Any help would be great
 
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Old 01-21-2011, 12:36 PM
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Sounds like the pump is pushing too much fuel for commanded vs actual. Do you have a pressure gauge? did you buy it new or used? If used is it the right one for the truck or was this on a ford as an example?
 
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Old 01-21-2011, 06:55 PM
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10-12 psi is what you should have going to it.

what is your fuel pressure right now?
 
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Old 01-23-2011, 06:45 PM
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the system is new for a duramax.just put guage and regulator on and turned it down to 5psi.seems to be fine so far.is 5psi to low?
 
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Old 01-24-2011, 02:05 PM
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no. The stock system was running at a vacuum.
 
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