Fuel system return line? needed?

Discussion in 'High Performance Modifications' started by Mwilson, Nov 3, 2017.

  1. Mwilson

    Mwilson Veteran Member

    I do not have one mine is deadheaded. I have never had a return line on any car, should I have one what do you guys do?
    muscl car likes this.
  2. RS1979

    RS1979 Veteran Member Lifetime Gold Member

    Jun 18, 2013
    Memphis, TN
    I don't use one. My fuel pump only has an inlet and an outlet fitting on it. Like you, I've never used one.
  3. muscl car

    muscl car Veteran Member Lifetime Gold Member

    That's why I'm getting that Magnafuel pump as it has a built in bypass /return set up
  4. Lowend

    Lowend Administrator. .a car, a man, a maraca. Staff Member Lifetime Gold Member

    Mar 25, 1999
    San Jose, CA, USA
  5. mrdragster1970

    mrdragster1970 Veteran Member Lifetime Gold Member


    I run the big pumps like rich boy does ^^^^^^ with the built in return.
    I also add a air bleed style return.
    I had a very hard time getting the N2O to hit right with the big pumps when it's dead headed!!!!
    Now I run an air bleed on both carbs and all 3 stages of N2O.
    It makes the pressure control much much easier!!!!!!!!!
    No more creep, no more added heat in the fuel etc etc!!!

  6. Da_Raabi

    Da_Raabi Veteran Member

    Jan 19, 2011
    Daytona Beach, FL
    I did a lot of research on this a few months ago. I was asking the same question. I'm in a fairly stock (well, its a 454. But its a stock 454) setup so I wanted to keep fairly close to GM design. I ended up going with a return just to be sure I had no problems. A return won't hurt anything, all it can do is help!
  7. Mwilson

    Mwilson Veteran Member

    I went to the local hot rod shop today ( Steve Ashworth Performance) and their pro mods don't have return lines
  8. Coadster32

    Coadster32 Veteran Member Lifetime Gold Member

    Oct 2, 2013
    I have a deadhead system also, but my return line is there. I plan on switching to this in the winter time. My pressures are good, and my camaro is a streeet only car.

    fuel filter.jpg
  9. Blown Camaro

    Blown Camaro American by birth, drag racer by choice

    Dec 13, 2009
    Deltona, FL
    Trying to figure this out. So you have a 3/8 coming out of that filter with a 5/16 return also out of the filter? How does it build pressure at all? Must use a very high pressure pump because I don't see how a 14psi pump would work. Also, 3/8 does not seem like it could support enough volume! I run AN8 on a street car and that is 1/2".
  10. mrdragster1970

    mrdragster1970 Veteran Member Lifetime Gold Member


    I learned about the air bleeds from a Pro-Mod guy at RT 66.
    It was a miracle cure for me.
    Like I said, I could not get a consistent launch with N2O before that.
    I still have the helmet I bounced over the fence when I was so mad
    I left my car on the starting line when it popped and walked back to my trailer!!!


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