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6.2 and 6.5 GM Diesel Discuss the 6.2 and 6.5 GM Diesels here

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Old 08-25-2013, 10:58 AM   #1
rickrocket71

Name: rickrocket71
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lift pump wont shut off

I have a 94 gmc 6.5 diesel that has a problem, the lift pump refuses to stop running when I shut the key off. I realize that it is made to run a few seconds until oil pressure cuts off. I have owned this pickup for ten years, so I am certain that pump is not wired direct, I have replaced lift pump and opsu, and does not change. The only way to stop it is by unplugging harness at pump. I also found that if I unplug opsu, it stops running. can my new opsu be bad or is it another problem I am not thinking of? I appreciate any help!
 
Old 08-25-2013, 01:20 PM   #2
THEFERMANATOR
 
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Name: THEFERMANATOR
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Sounds like a bad oil pressure sending unit. If unplugging it shuts it off, then you found the problem. ONLY use a genuine AC DELCO for it unless you want to have repeated failures.
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1995 GMC 2500 SUBURBAN 01 DURAMAX/ALLISON 3.42 gears 261 T-case mild built trans with ALOT of help from MIKE L. PI ML converter DIAMONDEYE exhaust CORSA muffler AFE stage 1 dry filter EFILIVE KENNEDY pump
95 SUBURBAN to a 01 DURAMAX/ALLISON - The Truck Stop
 
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