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Air bubbles in fuel line.

Discussion in 'Chainsaw' started by MrGiggles, Mar 9, 2009.

  1. MrGiggles

    MrGiggles ArboristSite Operative

    Jan 23, 2009
    Likes Received:
    I have been working on a 1973 Crafstman 2.1 chainsaw, and just recently got it running.

    It runs ok, it just needs some fine tuning. I am not sure what to think about bubbles in the fuel line. When it is idling, they move a little bit. When you rev it up, the rush to the front of the line and stay right before the metal from the carb input fitting. As far as I can tell, they don't really affect anything but I am wondering if they will or if they are harmless. It's a good old saw, made in the USA and has 2 compression rings.
  2. heimannm

    heimannm Addicted to ArboristSite

    Dec 28, 2005
    Likes Received:
    Dike, Iowa
    I ran into the same problem on a similar saw and had to change the fuel filter a couple of times to clear it up.

    Seemed almost like the vaccum from the carburetor pulling fuel from the tank was creating such a low pressure it was "boiling" in the line.


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