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Thread: Fuel line air bubbles

  1. #1
    Join Date
    Dec 2010
    Location
    Mudgeeraba, Qld
    Posts
    239

    Fuel line air bubbles

    Just replaced points with an accuspark elec unit. That all seems to be fine but just canít get a smooth idle. Plugs are a little sooty, so will thin the mixture a little and see how things turn out.
    I have noticed air bubbles in the clear fuel line that runs from the pump to the carby. Iím guessing there must be a little seal not doing itís job in the pump, although having overhauled it recently, Iíd be surprised.

    Would are bubbles into the carby impact on idle??????
    Mustlust

    1956 Series 1 86in
    1967 Mustang coupe - toy
    2011 Discovery 4 3.0
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  2. #2
    Join Date
    Aug 2006
    Location
    Melbourn(ish)
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    25,136
    not really,

    the bubbles will separate out in the bowl and the bowl is vented to the body so the fuel hitting the jets should be straight liquid.

    if they were getting into the jets you'd be running lean which would give the opposite results to the carbon fouling on the plugs you describe.
    Dave

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  3. #3
    Join Date
    Jun 2009
    Location
    australia
    Posts
    838
    Quote Originally Posted by Mustlust View Post
    Just replaced points with an accuspark elec unit. That all seems to be fine but just canít get a smooth idle. Plugs are a little sooty, so will thin the mixture a little and see how things turn out.
    I have noticed air bubbles in the clear fuel line that runs from the pump to the carby. Iím guessing there must be a little seal not doing itís job in the pump, although having overhauled it recently, Iíd be surprised.
    can pull in on the fu
    Would are bubbles into the carby impact on idle??????
    can pull aair in on the fuel bowl seals
    Russell Rovers
    Series I Parts Specialists
    russellrovers AT gmail.com
    Phone 0428732001

  4. #4
    Join Date
    Jan 1970
    Location
    Central West NSW
    Posts
    23,154
    Bubbles will not affect the idle. They indicate a leak somewhere on the suction side of the pump. Likely places are all connections, the gasket on the sediment bowl assuming you have one, and rust pin holes in the pickup pipe in the tank. Anywhere on the pressure side of the pump, including the pump diaphragm will show as a fuel leak.

    Leaks on the suction side may show as a slight fuel leak, but may not do so if they are slight, and certainly will not be seen if they are on the pickup pipe inside the tank.
    John

    JDNSW
    1986 110 County 3.9 diesel
    1970 2a 109 2.25 petrol

  5. #5
    Join Date
    Sep 2009
    Location
    Sydney
    Posts
    157
    What carby are you running? It may be throttle plate spindle/carby body wear allowing air to get sucked into the engine some times and not others. Put some thick grease around the area on both sides and see if you can adjust to get a smooth idle. It may be set rich to compensate.

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