Quote:
Originally Posted by karlaw
Great info, and thanks. I did the test, fp2 is no good.
So when I pull the pump assembly out of the gas tank, how do I know which pump is FP2 ???
Or should I just change them both anyways, car has 80,000 miles.
Another question is, should the car start if only fp-1 is working at 50 psi ?
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Secondary FP is the lower one. Minimal cost to replace both while you are doing the FP Sender R&R.
When the engine is cold & running above 500rpm, fuel management goes into Open Loop & both Primary & Secondary FP's are on. The engine will run on either or both FP's until it reaches above 104F, at which time the ECM switches from Open Loop to Closed Loop and the Secondary FP is shut down by the ECM.
You need to pull DTC's & look for a stored code 54. You may have an open circuit, a faulty connection at the ECM or faulty ECM.
__________________
Jerry Downey
JERRYS LT5 GASKETS & PARTS
http://www.jerrysgaskets.com
1994
ZR-1, Black/Black, Lingenfelter Aerobody, 416cu in, 3.91 gears, coil-over susp, Brembo brakes, etc.
2016 Black-Red, 3LT-Z51 Auto 8-speed.