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Thread: Carburetor fuel line problems

  1. #1
    OldRedFord Guest

    Default Carburetor fuel line problems

    The carburetor is a Holley 3310, 750 cfm with manual choke:

    This is the fuel line I was using:

    I had a hard time getting it to thread into the fittings for the fuel
    bowels. Had to start each fitting at the exact same time for it to
    thread in. But today when trying to start the motor the fittings for the
    fuel line kept leaking. I tightened them up a few times more, but no
    luck. I ended up taking the carb off the motor and the fuel line off the
    carb. I don't see any damaged threads but the fuel line is bent now.
    (That was yesterday.)

    Today I took the whole carb off the motor and put it on the work bench.
    Removed the chrome fuel line from the carburetor. Then I removed the
    fittings from the dual bowls. I looked at the threads on everything and
    the surfaces of the flares and everything looked ok to me. Then I
    loosely threaded the fittings for the fuel bowls onto the chrome fuel
    line and then threaded the fittings back into the carb. Then tightened
    the fuel bowl fittings up and then the flare nuts. Then I put the
    carburetor back on the truck and tried to start it again. The front
    fitting on the fuel line was dripping pretty good so I tightened both
    fittings up on that side. Still continued to leak at that fitting so I
    then took everything back apart and thats when I found that the threads
    in the fuel bowl are stripped.

    Im getting a new fuel bowl, some fittings that are 3/8 inverted flare on
    one end, and a barb for 3/8 hose on the other. Then a barbed T fitting
    and making my own flexible feed line. This setup will not look as cool,
    but it will be easier to remove one of the fuel bowls in the future if I
    have to.

    Am I just an idiot or what's going on here?

  2. #2
    Join Date
    Dec 2009


    Sounds like you cross-threaded the fittings, which didn't allow the flares to seat.
    When installing a one-piece line, some people loosen the fuel bowls to allow for slight alignment variations.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS T/W 11R 205 heads, 232°-244° duration/.623" lift/114° LSA camshaft, 12:1 C/R, TFS R-Series FTI ported intake, BBK 80mm T/B, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 200A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, -6AN fuel system plumbing, Walbro 255 LPH pump, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/3000 RPM converter, B&M Hammer shifter, FPP aluminum driveshaft, FPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 M/T Street Comp tires.

  3. #3
    erich1972 Guest


    What ever happened with your leak? I have the same problem.

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