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Thread: Replacing oil pressure switch?

  1. #1
    Join Date
    Apr 2020
    Posts
    4

    Default Replacing oil pressure switch?

    When returning home from an extended oversea assignment, found my '88 not starting.
    Trouble shot the fuel pump, it was not functioning and replaced it. Still no fuel pressure.
    Replaced the fuel pump relay, no change.
    From what research I've done so far, it appears the oil pressure switch is the culprit.

    2 questions:

    How can I trouble shoot the oil pressure switch to see if it is the problem?

    What is the proper procedure for replacing it if it is faulty? Looks to be a bugger to get at!

    Thanks.

  2. #2

    Default

    HI there,

    Remember, even if the oil pressure switch for fuel turn on is faulty, the back up is the ECM.

    When it sees engine RPM from the tach signal, it should turn on the fuel pump anyway.

    Please expand to tell us what your fuel pressure is, if any?

    Do you have RPM tach signal ???

    Allthebest, Paul
    GM World Class Certified Service Technician.
    Like us on Facebook: www.facebook.com/corvettemechanic
    Twitter: www.twitter.com/GMvettemechanic

  3. #3
    Join Date
    Apr 2020
    Posts
    4

    Default

    Hi Paul,

    When cranking the engine for 15 seconds-
    I see zero RPM on the dash tachometer,
    33 PSI oil pressure on the dash gauge,
    The fuel gauge I've connected to the Schrader valve on the fuel rail shows zero psi.

    The car will start immediately when I shoot some starting fluid into the intake plenum.

    Best regards,
    Jim

  4. #4
    Join Date
    Apr 2020
    Posts
    4

    Default

    I should add that it only runs for a few seconds when spraying the starting fluid into the plenum...

  5. #5

    Default

    HI there,

    I would then be looking at the connector to the fuel pump at the rear, to assure there are no spread terminals at the 4 pin connection. I feel that the issue may be there.

    Allthebest, Paul
    GM World Class Certified Service Technician.
    Like us on Facebook: www.facebook.com/corvettemechanic
    Twitter: www.twitter.com/GMvettemechanic

  6. #6
    Join Date
    Apr 2020
    Posts
    4

    Default

    Paul,

    The problem was inside the fuel tank as you suggested. The wiring inside the tank did show years of ethanol soak. Purchased a new tank fuel gauge assembly from the folks in Titusville, put it in and my car stared right up after priming the fuel line!

    Thanks for your help!
    Jim

  7. #7

    Default

    HI there,

    Great to hear, enjoy the ride!!!!

    Allthebest, Paul
    GM World Class Certified Service Technician.
    Like us on Facebook: www.facebook.com/corvettemechanic
    Twitter: www.twitter.com/GMvettemechanic

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