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Thread: mechanical fuel pump fitting

  1. #1
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    mechanical fuel pump fitting

    Marine fuel pump fuel in 3/8 NPT fitting, fuel out 3/8 inverted flair fitting correct?
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  2. #2
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    I can't tell from the picture (and I do know the difference), so take a trip to the local hydraulic shop.
    George Carter
    Central Florida
    gcarter763@aol.com
    http://kineticocentralfl.com/


    “If you have to argue your science by using fraud, your science is not valid"
    Professor Ian Plimer, Adilaide and Melbourne Universities

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    Good suggestion

    George,
    I do business with a shop that should be able to help me figure out what I need. It won’t be long now; goal is to complete wiring this weekend and set the motor back in the boat next week to take measurement for the built to fit risers.
    Thanks,
    Bob

  4. #4
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    I think this is the same Holley pump Bobby, and if I recall, it's also NPT to the fitting you use to supply the carb.
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    Maddy's Daddy
    L.I.,N.Y.

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    Mike,
    Sure looks like the same fuel pump thanks for posting the picture.
    Bob

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    Fuel Pump Fittings

    Bob~

    Most fuel pumps use a 3/8" male NPT pipe threaded 90* Weatherhead street "L" fitting to screw-in the pump's outlet with the other side of the 90* fitting having a female inverted flare for a matching flare tubing "nut".
    Your steel, or copper fuel, line to your carb itself should have the actual male flare nuts flared on this tubing .
    I like to double flare these flare nut units just like brake lines.

    The other intake side of the fuel pump usually has a 3/8 ", or similar brass hose barb fitting for the marine fuel hose to push-on with two SS screw clamps.

    There are also many other ways to do this with various other syle fittings & aircraft lines.

    NAPA, or a any similar good auto supply store, can fix you up with the proper "Weatherhead " brand forged brass fuel line fittings.
    Last edited by silverghost; 04-23-2012 at 05:03 PM.
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    Brad,
    Thanks for the reply and good explanation it helped me sort things out.
    Bob

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    You can convert the NPT to a flare with an adapter and use metal gas lines. They are simple hardware store items. The gas lines need to be coast gaurd approved for fire retardent for a specific amount of time. That is why it is best to use steel lines as they don't melt, and they go way beyond the requirement


    machinist ,bore it deeper,ream it bigger, and lap it to a fine finish



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  9. #9
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    Question on the steel fuel lines and fuel with ethanol. Could rust/corrosion become an issue over time?
    1976 Hornet with big block chevy --- contemplating the name "Money Hemorrhager"

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  10. #10
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    I would think corrosion would be non existant. I think they are some what presurized all the time and oxygen isn't really present like in a half full gas tank. I haven't had any problems ,but stainless steel is always an option .
    machinist ,bore it deeper,ream it bigger, and lap it to a fine finish



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