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Fuel Pressure Regulator open? Starts won't run 200 1986

posted by  johnbrady on  Thu Sep 1 16:29 CST 2016
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last visit: Wed Feb 26 12:28 CST 2014
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Car would start but not run. Bypassed fuel pump relay, checked FI relay, disconnected MAF, full tank; no luck. No fuel at vacuum input to fuel pressure regulator (FPR). Clamped down (pinched off a little) on the return line from the FPR and the engine runs. Has anyone seen a FPR fail open? Could I still have a clogged filter or weak pump?
Thanks in advance,
John








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    It is a guess.... 200 1986

    uid 27's pic
    posted by  Art Benstein on  Thu Sep 1 18:38 CST 2016
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    last visit: Fri Oct 17 20:10 CST 2014
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    I've had one of that construction (pre-88) fail stuck because the spring rusted in two, so I can imagine if the ball fell out it could fail open.

    If you can't cobble up a pressure gauge, you're stuck with part swap diagnosis. It doesn't make sense a filter clog or insufficiency in pump pressure could be helped by closing down the return path if the regulator was indeed functioning correctly. No sense at all.

    But the regulator could be OK, and the pressure OK too, if the AMM is reporting much less air than is actually passing into the engine, as a consequence of a variety of common troubles, so your richening of the mix by increasing the rail pressure might make it run.
    --
    Art Benstein near Baltimore

    Don't be irreplaceable. If you can't be replaced, you can't be promoted.







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      It is a guess.... but Art's guess was correct 200 1986

      posted by  johnbrady on  Sat Sep 3 15:10 CST 2016
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      last visit: Wed Feb 26 12:28 CST 2014
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      Art is correct. The FPR is not the problem. My test was just enriching the mixure. The other day when I disconnected the MAF, the car wouldn't run. Today, of course, it would run with the MAF disconnected. Damn it Murphy! MAF is on order. Will update when I get it installed.
      Thanks Art.







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