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Keeps dying after starting

Discussion in '2nd Gen 4Runners (1990-1995)' started by Bills86e, Jun 30, 2016.

  1. Jun 30, 2016 at 2:04 PM
    #1
    Bills86e

    Bills86e [OP] New Member

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    I start her, then she dies. Re-try, but same.
    I have an access panel under the passenger rear seat, so I removed the fuel pump and tested it on my bench. It was fine, but I put a new one on the module anyway, it tested fine too.
    After install, symptoms remain same. Wire has power after she dies. Any ideas?
    Where is the FP regulator located? Where is the circuit opening relay at?
    I'm thinking to hook a battery direct to pump, to rule one out.
    1994 4runner 3.0 FI 3VZE
     
    Last edited: Jun 30, 2016
  2. Jul 3, 2016 at 8:34 AM
    #2
    Bills86e

    Bills86e [OP] New Member

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    I removed the access two panels under rear passenger seat, took off the fuel pump return line, put a clear long 1/4" id hose on the return barb and other end into a catch bottle. Started the engine and fuel flowed very well. Then, when engine died, the fuel quit flowing too.
    I guess I can rule out a bad pump and COR? It still starts, runs briefly, then dies out. Any Ides?
     
  3. Jul 3, 2016 at 8:51 AM
    #3
    Bob

    Bob Member Staff Member

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    SoCal
    Sub'd for any solutions
     
  4. Jul 5, 2016 at 8:51 AM
    #4
    Bills86e

    Bills86e [OP] New Member

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    Also to rule out the pump, With key on I jumpered the B+ & FP in the diagnostic box, but same results.
    Removed Distributor cap and polished off some corrosion on the pins, same agan. No vac lines are cracked or broken.
    She will run about a minute, tops. Slowly putters out. This has me stumped.
     
  5. Jul 6, 2016 at 11:19 AM
    #5
    Bills86e

    Bills86e [OP] New Member

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    SOLVED this PROBLEM

    Got back on it this am after a night of mental possabilities.
    Got out the Timing light and everything went all good.
    Next I removed the PF cover again and used the clear line trick. NOTHING was flowing! Tested incoming power - All GOOD! WTF
    Removed the pump module again to bench test again. Then I found it.
    The positive wire into the connector. (checking with voltmeter)
    So I cut the wire at pump connector and found corrosion, about 5/8" worth.
    Cut that away and used a tube crimp connector, and wiggling the wire was
    now not intermittant! I did not notice that when installing the new pump.
    Old pump is good too. My guess is the bad wire would fail once carrying amps
    or/and the vibration of the pump when powered.

    The wife has quit muttering. YEAAAAAAAAAAAAAAAAAA
     
    Bob likes this.

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