Fuel filters on suction side?

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  • Buccaneer

    US Member - 1 Year (includes $3 online payment fee)
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    #274093

    Would the diaphragm fuel pump and carb work okay
    with a inline filter in the gas tank hose, assuming
    the filter stays relatively clean?

    The fuel pump and carb on this 1960 Scott 7.5 is
    integrated, hence a filter can’t be installed in between
    the two.

    There’s a tiny screen (like chainsaws) in the carb, otherwise
    there’s no other filtration. The only problem, the powerhead
    has to be removed to work on the carb.

    DSCN6469

    Prepare to be boarded!


    frankr

    US Member - 1 Year (includes $3 online payment fee)
    Replies: 6715
    Topics: 51
    #274107

    I don’t know any reason it wouldn’t work fine.


    dave-bernard

    US Member - 1 Year (includes $3 online payment fee)
    Replies: 2014
    Topics: 30
    #274108

    that is where water separators go.


    Buccaneer

    US Member - 1 Year (includes $3 online payment fee)
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    #274111

    Thanks guys!

    Prepare to be boarded!


    jeff-register

    US Member - 2 Years
    Replies: 1564
    Topics: 54
    #274119

    I used an in-line chain saw filter on my 54 Firestone 7.5 ahead of the motor & never had any issues.


    billw

    US Member - 2 Years
    Replies: 2071
    Topics: 66
    #274120

    On my McCullough 9, (almost identical-looking motor) there is an OEM fuel line connector of the small, bayonet style, that looks like it would also be a fuel pump….but it’s a filter. I would post a picture, but it’s taken apart right now.

    Long live American manufacturing!


    Buccaneer

    US Member - 1 Year (includes $3 online payment fee)
    Replies: 7495
    Topics: 1072
    #274123

    I ordered a couple of inline, 1/4″ barbed filters, advertised
    as “motorcycle” filters. I would think they would do it.
    I forget how many “microns” in filtration.

    Prepare to be boarded!


    Mumbles


    Replies: 5764
    Topics: 298
    #274199

    If the item you are installing has a screen inside it, it is meant for gravity fed systems.  If it has a paper filter, it is meant more for pump systems as found on lawn tractors. The screened one will work with a pump but it’s not such a good idea to use a paper filter in a gravity system.

    Years ago I thought I was smart and installed an inline automotive filter in the fuel line to my 55 horse Chrysler. It didn’t work very well as the filter clogged up killing the motor. The tanks were fairly clean so I think the element inside was so fine it wouldn’t let the oil in the mix pass through. Not sure.


    Buccaneer

    US Member - 1 Year (includes $3 online payment fee)
    Replies: 7495
    Topics: 1072
    #274202

    Mumbles, I have to think that the filters I ordered are some kind of
    paper element, but not sure. It does say that they are 60 micron
    filtration, which according to a conversion chart, is just a little
    over .002. That could be a problem.

    https://www.ebay.com/itm/394423150566

    If the item you are installing has a screen inside it, it is meant for gravity fed systems.  If it has a paper filter, it is meant more for pump systems as found on lawn tractors. The screened one will work with a pump but it’s not such a good idea to use a paper filter in a gravity system.

    Years ago I thought I was smart and installed an inline automotive filter in the fuel line to my 55 horse Chrysler. It didn’t work very well as the filter clogged up killing the motor. The tanks were fairly clean so I think the element inside was so fine it wouldn’t let the oil in the mix pass through. Not sure.

    Prepare to be boarded!

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