Carb. Leakes Gas

Discussion in 'Mechanic and Repair' started by ant, Jan 6, 2002.

  1. ant

    ant LawnSite Silver Member
    Posts: 2,442

    11 hp briggs/ic carb leakes gas while off sitting in shop.
  2. Richard Martin

    Richard Martin LawnSite Fanatic
    Posts: 14,700

    Without seeing the carb or a little better explanation of where the fuel is leaking from I can suggest 2 things. Replace the fuel line as it may have a crack in it or replace the round gasket on the bottom of the float bowl where the air mixture screw goes through the float bowl. If you want a simple fix just close the fuel shutoff valve.
  3. ant

    ant LawnSite Silver Member
    Posts: 2,442

    rich thanks forv your reply,i will see if i can take a picture and post it..
  4. Derdader

    Derdader LawnSite Member
    Posts: 6

    My 11 hp B&S was doing the same thing. Between the air intake and the engine is a butterfly valve I assume is the govenor. This butterfly is mounted on a rod which requires rubber seals on each end that prevents raw gas from leaking out. Mine were dry rotted away and they are NOT included in the carb rebuild kit. Hope this helps.
  5. ant

    ant LawnSite Silver Member
    Posts: 2,442

    i took a picture of it......

  6. Robert Doubrava

    Robert Doubrava LawnSite Senior Member
    Posts: 342

    Richard's right about the gasket on the bowl. That's what happened to a 7 HP B&S vertical we have. We left the gas on, and it ruined the gasket.:( Cost about $5 bucks to replace the gasket!!
  7. Remo Sid

    Remo Sid LawnSite Member
    from USA
    Posts: 55

    Sounds like the needle and seat need some attention. Or may have a small hole in the float.
  8. Richard Martin

    Richard Martin LawnSite Fanatic
    Posts: 14,700

    I agree with Remo Sid on this. Replace the needle and seat. If it has a brass or plastic float shake it and if it has any moisture in it replace that too. If it's a solid float put it in a small cup of fuel (please be carefull, this stuff is flammable beyond belief) and if more than half of the float sinks replace it. Also replace the bowl gaskets.
  9. Fish

    Fish LawnSite Member
    Posts: 139

    These carbs love to flood. I would try the new needle and seat
    and you will probably tear the gaskets too. If it still gives you
    problems, then an inline shutoff may be the way to go. Be careful
    on the teardown of this carb, the jet must be removed from the
    bottom before trying to take the carb apart. Of course check out
    the float while it is in your hand.

    BRIAN GALLO LawnSite Senior Member
    Posts: 282

    I agree with some of these other guys. If the leak is coming out of the throat of the carb and then running down, it's probably the float or needle/seat. Good luck.

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