1/2 inch fuel line

Discussion in 'Engine Topic' started by rhino370, Jan 5, 2017.

  1. jimrr

    jimrr Veteran Member

    Jun 12, 2016
    Every time I look at this thread, keep thinking dodge is putting 707 horsepower in the challenger, no 1/2 inch fuel line in that car....just saying.
  2. rhino370

    rhino370 Member

    Oct 18, 2006
    this is my first big block with a holley 850 on it, everything i read said i needed a bigger fuel line, but if 3/8 will work,woulb be a lot less hassle. thank you for the replys
  3. udloze

    udloze Veteran Member

    Mar 30, 2011
    new york
    i work in the marine industry when I do repowers with BBC MPI engines they require 1/2" fuel lines. the NPT fittings on the tanks and on the engine are only 3/8" NPT and this is not a problem. per the manufacturer. these engines run WOT for extended periods of time with zero issues. if 3/8" NPT is good for them it should be good for your car. that sees the occational flogging.
  4. Patrick73RS

    Patrick73RS Veteran Member Lifetime Gold Member

    Got a solid roller rectangular head 468 with 3.73 gears and a 4 speed. It lives without a 1/2 line just fine.
  5. Notalent

    Notalent Veteran Member

    Jan 27, 2010
    You didnt state electric fuel pump. You can run a 3/8 line and be fine, but a 1/2" gives you room to grow. Bob West ran a Chevelle in the 9.90's with a 3/8 fuel line and I believe a Mallory Comp 140 pump.

    I run a 1/2" fuel line with Mallory Comp 140 pump, 675HP/645TQ 10 second car and she doesn't run out of fuel....stays at a consistent 5.5-6PSI.

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