Fuel pump pressure

JasonNC
JasonNC Expert Adviser

I have installed a Carter rotary electric fuel pump, a Holley 12-804 fuel pressure regulator, and a Holley 26-500 pressure gauge on my 49 Super Six coupe. It has a 262 engine with a Twin-H setup. According ChatGPT (my daughter turned me onto it), I should shoot for pressure in the 4 to 4.5 psi range. Thought I would get an opinion from a human source.

Comments

  • ratlee2
    ratlee2 Expert Adviser

    The manual lists 3 to 4 psi for the combination pump and 3 1/2 to 4 1/2 psi for the standard pump. I run 3 1/2 on my 262 twin H and don't have any issues with carb needles leaking.

  • JasonNC
    JasonNC Expert Adviser

    Thank you.

  • WABOOM
    WABOOM Member
    edited July 26

    I put an electric pump on my 54 Hornet Twin H 308. I set up a feed thru type system that goes to a bypass regulator and returns to tank.

    For the pump I used a fuel Facet Gold Flo cylindrical pump (6-8 psi , 32 GPH) , the regulator is Holley 12-887 set to its lowest setting of 4.5 psi.

    I have ran it up to 6 psi for a few days and the needles did not seem to leak, But I now keep it the regulator at it's lowest setting of 4.5 psi.

    The return is 3/16 brake T'd into the vent hose and hasn't caused any problems.

    Maybe the return helped prevent the needles not get overwhelmed I don't know...


    Just thought I'd share.

  • JasonNC
    JasonNC Expert Adviser

    I find it interesting that you have your gas line coming in from the driver's side of the car. I never thought about that since the old gas line on both my Hudsons went up the passenger side. When I get a chance and if I can remember how to do so, I will post some pictures of my setup. I finally got it to crank and I think I have the pressure regulated to a safe number, but it's not idling properly. I am going to check the timing to see if that may be the problem.

  • WABOOM
    WABOOM Member

    That's the return side. The supply line is on the passenger side to the front carb like normal.

    What throws most people off is the regulator being after the carb. The regulator CAN be after the carb.

  • JasonNC
    JasonNC Expert Adviser
  • JasonNC
    JasonNC Expert Adviser

    Th

    This is what I tried to do earlier.

  • WABOOM
    WABOOM Member

    Cool man. Thanks for the follow up.