Fuel filter and/or separator before or after pumpkin?
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Fuel filter and/or separator before or after pumpkin?

  1. #1
    Senior Member az_mike's Avatar
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    Default Fuel filter and/or separator before or after pump

    Starting to think about plumbing on my daycruiser build... BBC/Holley carb, mech fuel pump..

    ive read conflicting stuff about fuel filters and where to put them.

    1. Is a filter/water separator a good idea (like the Wix 33405 or FST remote screw on) or a waste ?
    2. Read one place that AFTER the pump (under pressure) can start a fire if a leak, but BEFORE a pump can cause vapor lock?

    3. some guys I understand run two.

    What are people running in their lake boats?
    what is ideal?
    Last edited by az_mike; 09-03-2017 at 06:34 PM.

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  3. #2
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    Default filter filter

    I've always run the filter/H20 separator before the mechanical pump (holley 110). One hallett was -8 lines from tanks to the filter and -8 to the pump (496 with single 950 holley). Current hallett is -10 from both tanks to the separator and a -10 to the mechanical pump and -8 to the carb(565 with single 1150 dominator)

  4. #3
    Senior Member TexasJet's Avatar
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    Before fuel pump in both boats. No issues.

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  6. #4
    149 BGJ-Willis Power 540 willis's Avatar
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    Default Helful tools

    September 4, 2017
    Hello People
    You may find this article helpful.

    https://www.jegs.com/InstallationIns...510-12-150.pdf

    Willis

    149 BGJ 156.74 MPH @ 1000'

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