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Questions about fuel pressure regulator relocation, pressure setting, firewall drilling, etc.

Discussion in '1st Gen. Tacomas (1995-2004)' started by redneck_adjacent, Oct 11, 2023.

  1. Oct 11, 2023 at 5:56 PM
    #1
    redneck_adjacent

    redneck_adjacent [OP] Well-Known Member

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    Hi, friends.

    There are threads around here which are helpful for what I want to do but I am struggling to get precisely what I need altogether.

    I want to install an aftermarket fuel pressure regulator onto my 3RZ-FE, namely the Turbosmart FPR 800.

    Here are my questions:
    • What is the best way to relieve fuel pressure from the fuel rail on a 3RZ-FE without creating a mess?
      • Would it work if I started the truck for a few seconds with the fuel relay deactivated via kill switch?
    • What is the recommended way to determine the appropriate fuel pressure for this aftermarket regulator?
      • Should I set the pressure limit according to the pressure at ignition-pump priming, idle, or a certain RPM level?
    • I want to mount the aftermarket fuel pressure regulator onto the firewall. Should I be careful drilling screws into the firewall in certain locations?
    • If mounting the fuel pressure regulator is unwise or ends up not working out then how would you recommend mounting it near the fuel rail?
      • The included bracket will not fit onto the fuel rail. I searched for suitable alternative brackets. I could not find any. I might need to find someone to help me fabricate one instead. How are you mounting the regulator near the fuel rail?
     
  2. Oct 12, 2023 at 12:54 AM
    #2
    redneck_adjacent

    redneck_adjacent [OP] Well-Known Member

    Joined:
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    Mike
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    1997 Tacoma 2.7L 4x4 W59 MT
    5 PSI supercharger 3" lift Bilstein 5100 shocks Old Man Emu springs General Spring leaf springs with 2" blocks and extended shackles 31" Firestone Destination XT tires LCE header and catback exhaust HPS CAI Tundra S13WE front brakes KC HiLites flood, ditch, fog, and backup lights Eaton Bussmann relay/fuse panel with custom power tray All Pro bumpers, sliders, and skid plates
  3. Oct 12, 2023 at 2:55 PM
    #3
    Speedytech7

    Speedytech7 Toyota Cult Ombudsman

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    The 3RZ regulator is a 3bar static, 1:1 rising rate unit. You're trying to duplicate that if you have a stock computer. Set pressure with pump on, engine can be running at idle or not, you just want the voltage to be engine running voltage (or close enough). You cannot have both regulators present... so you'll need to make a regulator block off plate and tap it for a barb to feed that nice aftermarket unit.
     
  4. Oct 12, 2023 at 3:10 PM
    #4
    Speedytech7

    Speedytech7 Toyota Cult Ombudsman

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    #4
  5. Oct 12, 2023 at 3:29 PM
    #5
    redneck_adjacent

    redneck_adjacent [OP] Well-Known Member

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    Bellevue, WA
    Vehicle:
    1997 Tacoma 2.7L 4x4 W59 MT
    5 PSI supercharger 3" lift Bilstein 5100 shocks Old Man Emu springs General Spring leaf springs with 2" blocks and extended shackles 31" Firestone Destination XT tires LCE header and catback exhaust HPS CAI Tundra S13WE front brakes KC HiLites flood, ditch, fog, and backup lights Eaton Bussmann relay/fuse panel with custom power tray All Pro bumpers, sliders, and skid plates
    Thank you for that information about setting the base pressure; that definitely helps.

    I have the fuel rail adapter; that part is good to go.

    I am still trying to figure out how or where to mount the regulator, though.

    It has a bracket like mentioned in OP. I will probably just drill into the firewall which I think will be OK.
     
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    #5
  6. Oct 12, 2023 at 3:31 PM
    #6
    Speedytech7

    Speedytech7 Toyota Cult Ombudsman

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    You're totally fine to drill into the firewall. I mean some places will poke through on the other side but if it's far enough up it'll only go into the cavity where the windshield wiper transmission is and I've seen plenty of people mount light stuff to that
     

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