5.7 TBI runs rich, hesitates... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

07-01-2011, 10:03 PM

#25

rfmaster

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Join Date: Oct 2003

Location: OC CA

Posts: 1,374

Re: 5.7 TBI runs rich, hesitates...

Quote:

Originally Posted by JCampbell

Hmmm...12 psi, but blocking the return line bumps the line pressure up to about 14-15 psi.

Fuel pressure reg?

This is a tough one to call - fuel pressure regulator is doing its job by keeping FP at 12 PSI. The pump has just enough to dead head pressure (14-15pSi) - like to see 20+ psi to be sure. Does not look like FP is at fault here...

//RF

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