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Thread: Constant 12 volt fuel pump supply

  1. #16
    Junior Member Too Much Toyota oldcorollas's Avatar
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    Default Re: Constant 12 volt fuel pump supply

    perhaps you could wire an LED from the fuel pumps power to ground... so that you can see whenever the pump has power...

    that way, if it is momentarily dieing as it switches over, you will see it...
    fuel pump momentarily losing power might do it.... but it should take a few seconds for the fuel pressure to decrease anyway...
    it sounds like poor tuning... but ya never know fuel pump voltage mod sounds cheaper and easier to try first
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  2. #17
    Founding ****** Automotive Encyclopaedia Mos's Avatar
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    Default Re: Constant 12 volt fuel pump supply

    You probably won't see the LED turning off the switching time would be in the order of tens of milli seconds.
    The pump should have enough mechanical inertia to run through the switchover anyway...

    Mos.
    Admin, I.T., Founding Member, Toymods Car Club Inc.
    2000 IS200 Sports Luxury 1UZ-FE VVTi, 1991 MX83 Grande 2JZ-GTE (sold)

  3. #18
    Nay sayer Domestic Engineer Mr Ed's Avatar
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    Default Re: Constant 12 volt fuel pump supply

    Quote Originally Posted by shinybluesteel
    yours didn't have a circuit opening relay?
    My GA70 circuit did but my 2JZ doesnt have an AFM to switch it open.
    I used to eat alot of natural foods. That was until I learned that most people died of natural causes.

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