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high fuel pressure... '95

Discussion in '1st Gen. Tacomas (1995-2004)' started by Laurian, Sep 7, 2011.

  1. Sep 7, 2011 at 4:45 PM
    #1
    Laurian

    Laurian [OP] New Member

    Joined:
    Sep 7, 2011
    Member:
    #63070
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    3
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    Male
    Vehicle:
    95 taco with elk dents
    So one my pet projects is to try to breathe life into an old 95 tacoma. It stills starts at least. I recently did a fuel pressure test, and it was high: 48psi, when the book says it should be 31-37. It didn't matter if the vacuum was on or off the regulator.

    Assuming i didn't miss a kink in the return line, then is a bad regulator the only thing that would do this? or can something else cause high fuel pressure? I applied my own vacuum to the regulator, and got it to drop 44psi, so it seems to work somewhat. And I'm not sure that where Toyota attaches the vacuum hose would really create a vacuum.

    Also, how badly would you think that a tacoma with this high of a fuel pressure would run? I'm thinking this is not my primary problem, but i could be wrong.

    Unfortunately I dont currently live where my taco is, but i try to get ideas on what to look at the next time i'm in town.
    [​IMG] [​IMG] [​IMG] [​IMG]
     
  2. Aug 30, 2015 at 3:52 PM
    #2
    Secret Fire

    Secret Fire New Member

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    #163022
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    Hey Laurian, did you ever find the cause of this? My 2004 is doing something similar, idles at 46 psi and the spec for this year is 31-37 too.

    The FSM also says I should have 38-44 psi when the ignition is ON but engine not running and I don't read any pressure then.

    Its supposed to hold 21 psi for at least 5 mins after turning off the engine but my pressure drops to zero within 10-20 secs.

    It runs but pretty rough. Idles fine but when I accelerate or put load on the engine it sputters, not like it's trying to die but momentary losses in power. Symptoms don't show every time I start it, maybe about half the time right now, and if I keep driving when it does show symptoms, they eventually fade away and it seems back to normal. Replaced the fuel filter, pump was my 2nd guess, but with 46 psi at idle I'm wondering about the regulator now.
     
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