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TMOORSE
New Member

USA
7 Posts
Posted - 06/13/2018 :  12:37:25 PM  Show Profile  Reply with Quote
have a 2010 6.6 Duramax diesel. The fuel pump will not shut off,Giving me a code of po088 when connected to a scanner. Its a Thomas Mid bus, and I am trying to locate the fuel pressure relay switch, I'm thinking it is stuck open. TIA

eddo
Advanced Member

USA
311 Posts
Posted - 06/15/2018 :  08:29:15 AM  Show Profile  Reply with Quote
LMM or LGH engine?

I'm not sure there is a separate fuel pump apart form the injector pump. It is my understanding that the high pressure pump does it all (at least, no the LGH engine.)

p0088 would have me start checking out the fuel pressure regulator.
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