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2005 escalade esv 34 psi fuel pressure at idle

VikingTrad3r

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VikingTrad3r Enthusiast

VikingTrad3r

Posted
Posted

2005 escalade esv awd lq9 6.0

 

just bought it. exhaust smelled rich. both banks lean. diagnosis i discovered 34 psi fuel pressure at idle. 

 

im fairly sure from my searching it should be +- 60psi. 

 

from what ive read, there is NO fpr. or at least its built into the pump. 

 

couple questions:

 

is there ANY thing other than a failing pump that this can be?  massive vac leak?  not sure if the fpr built into the pump is operated off vac?

 

how is it possible the truck starts and runs? it may be down on power but it feels similar to my 2006 lq4 denali xl. 

 

thoughts?

davester Senior Enthusiast

davester

Posted
Posted

Most likely, it's the fuel pump.  You shouldn't have an inline fuel filter (it should be part of the fuel pump) [but I'm not sure on the specifics of your vehicle, it may have one].

 

These engines can run on really low fuel pressure, the ecm tries real hard to compensate.

 

For my truck, when I bought it, the fuel could provide 60 psi at idle, but once the engine started needing more gas, the pressure would drop to 10 psi.  The engine still ran, just the fuel trims were way out of wack as the ecm was just opening the injectors for a longer period of time to try to get enough fuel into the engine (and of course, the engine had very little power).

 

Fuel pump is electric, and in the tank (at least, it is for trucks, probably the same for you, but again, not certain about that.

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