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Still have stumble/rough issues 850 1995

posted by  roger on  Tue Sep 21 17:29 CST 2010
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last visit: Fri Sep 12 22:18 CST 2014
[RELATED]

Fuel pressure check seems ok.

Engine off, relay jumpered, read ~46 psi. Not sure of the gauge calibration, so it could be the gauge off by 2.5 psi, not the fuel pressure. Generally in conformance to spec.

I pinched off the return line, and the pressure went up quickly. Released before it exceeded 86. (It was heading to shoot right past.)

Kept the gauge on and started the engine; fuel pressure dropped to ~37 psi. Pulled off the vacuum hose from the vacuum tree, and the fuel pressure jumped right back up to 46psi. Put hose back on, and it dropped again to 37psi. Also of note, no fuel came out of the vacuum line to the FPR when it was disconnected while running.

Thus, while I did not get an exact gauge reading, I am concluding that the fuel pump, fuel filter, and fuel pressure regulator are generally working and not the source of the problem.

Roger






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