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Stock Fuel Pump/regulator Issues

Discussion in 'Performance and Tuning' started by My68ur8trd, Apr 12, 2010.

  1. Apr 12, 2010 at 9:15 AM
    #1
    My68ur8trd

    My68ur8trd [OP] Well-Known Member Vendor

    Joined:
    Oct 7, 2007
    Member:
    #2961
    Messages:
    1,532
    Gender:
    Male
    First Name:
    Justin
    Williamsburg, VA
    Vehicle:
    2007 TRD OR Dcab 4x4
    URD Catback | TRD CAI | TRD S/C | APR X-1 | DTLT | APR 2.85" Pulley |Fabtech 6" | Icon C/O | Alcan Leafs | 33 Grabber AT2 | 17" XD Addicts
    I just want to let you guys know what I have going to just for information to those with similar situation.

    My truck has 36K on it and was a daily driver for the last owner who seems to have ran regular fuel for its entire life.

    I put the TRD S/C with the stock pulley on it two weeks ago and the X1. When Gadget and I ran it up and down the interstate, the injectors were maxed at 95% duty cycle ( yep and this is on the stock pulley).

    Well I put my fuel pressure gauge back in yesterday and took it for a spin. Normal driving the FPR hovers around 40 PSI ( system is supposed to be 42.5, but my gauge has always read 40).

    WOT the pressure tanks to about 33[​IMG]


    So time for a URD pump upgrade. But I wanted you guys that are boosting trucks with a few more miles on them to know. Even with the stock pulley, the system is maxed if the filter is gummed up. I dont know how the TRD reflash would handle it, but the X1 does its job by increasing the DC to compensate

    Also,

    The regulator seems to be leaking too.

    I had the oddly long start ever since I got the truck. When I shut it down, the FP drops from 40 psi to 0 in about 3 seconds. Which explains it

    So I will be changing that too.

    the quirks of a used vehicle [​IMG]

    Justin
     
  2. Apr 12, 2010 at 11:49 AM
    #2
    XrunnIT

    XrunnIT Well-Known Member

    Joined:
    Jul 6, 2008
    Member:
    #7770
    Messages:
    856
    Gender:
    Male
    Austin, TX
    Vehicle:
    1GR-GZE X-Runner
    Built Motor by LC Engineering Boosted by TRD
    Actually per Toyota -
    Standard Fuel Pressure: 281 to 287 kPa (2.87 to 2.93 kgf/cm2, 40.8 to 41.7 psi).
     
  3. Apr 12, 2010 at 11:59 AM
    #3
    My68ur8trd

    My68ur8trd [OP] Well-Known Member Vendor

    Joined:
    Oct 7, 2007
    Member:
    #2961
    Messages:
    1,532
    Gender:
    Male
    First Name:
    Justin
    Williamsburg, VA
    Vehicle:
    2007 TRD OR Dcab 4x4
    URD Catback | TRD CAI | TRD S/C | APR X-1 | DTLT | APR 2.85" Pulley |Fabtech 6" | Icon C/O | Alcan Leafs | 33 Grabber AT2 | 17" XD Addicts
    then the gauge isnt that far off:)

    toyota would pick a wierd non standard pressure

    Justin
     
  4. Apr 12, 2010 at 2:14 PM
    #4
    XrunnIT

    XrunnIT Well-Known Member

    Joined:
    Jul 6, 2008
    Member:
    #7770
    Messages:
    856
    Gender:
    Male
    Austin, TX
    Vehicle:
    1GR-GZE X-Runner
    Built Motor by LC Engineering Boosted by TRD
    Yep, I'd say your gauge is pretty damn accurate. Mine will sit between 38-40psi, and i've read taht there is anywhere from 1-2psi discrepancy depending on the sensor.
     
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