Sucking Air?

Discussion in 'Heavy Equipment & Pavement' started by cat2, Feb 22, 2008.

  1. cat2

    cat2 LawnSite Senior Member
    from Mi
    Posts: 891

    For some reason my bobcat seems to be getting air in the fuel lines. I can tell when it happens, because it will lose some power, but will run ok. I could run all day like this, it just doesn't have the the power it should. Any one else have a problem like this.









    No bobcat ron i'm not going to trade it for a cat
     
  2. BIGBEN2004

    BIGBEN2004 LawnSite Senior Member
    Posts: 823

    Did you change the fuel filter first? It could be clogged or the seal could be bad and allowing air. I would try that first it is cheap and good to change anyways.
     
  3. bobcat_ron

    bobcat_ron LawnSite Fanatic
    Posts: 10,119

    Fuel pick up line shot?
     
  4. BIGBEN2004

    BIGBEN2004 LawnSite Senior Member
    Posts: 823

    Yea that is another question for ya, does it seem to do it more when the fuel level is full,or more toward empty?
     
  5. cat2

    cat2 LawnSite Senior Member
    from Mi
    Posts: 891





    Not sure to tell you the truth. Today i had a 1/2 tank at the start of the day,at the end of the day i was a little above the red mark
     
  6. Gravel Rat

    Gravel Rat LawnSite Fanatic
    Posts: 9,544

    Is the motor turboed ?

    If so your loosing boost. Any black smoke ?

    Air in the system will make it stumble or stall a restricted fuel filter will decrease a little in power.

    How is the air filter ?

    Sources of air that can get into the fuel is a knicked fuel filter gasket a small crack in the fuel line or return line leaks.

    If your getting air in the system the machine will be a SOB to start when its cold.

    How many hours on the machine ?
     
  7. Scag48

    Scag48 LawnSite Fanatic
    Posts: 6,067

    Start with a new filter first. If it still does it, check all your fuel delivery lines. If it's still going, the turbo is screwed up, but I doubt that's what it is.
     
  8. BIGBEN2004

    BIGBEN2004 LawnSite Senior Member
    Posts: 823

    Do you smell diesel when it does it. If so then surely a fuel leak somewhere.
     
  9. YellowDogSVC

    YellowDogSVC LawnSite Gold Member
    from TX
    Posts: 3,759

    symptoms could be pickup line in tank or fuel filter or water
     
  10. cat2

    cat2 LawnSite Senior Member
    from Mi
    Posts: 891










    yes it has a turbo, no black smoke. Starts good. 536 hours
     

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