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What's this carb fitting for???

Discussion in 'Mechanic and Repair' started by smokediver, Aug 15, 2007.

  1. smokediver

    smokediver LawnSite Member
    Messages: 59

    23hp Briggs vanguard, vertical. Has 2 fittings on top of the carb. One is for the fuel line, but the other has nothing. There doesn't seem to be any vacuum or pressure on it, and plugging it doesn't seem to make any difference in how the engine runs.
    The engine has been retroed to a gravely zero turn, from what I don't know. It pops and sputters, and smells rich, but the carb is clean.
    It also eats spark plugs like popcorn, cracking the insulators and causing them to short sideways.
    Any ideas, And what's that fitting for??
  2. fixer67

    fixer67 LawnSite Silver Member
    Messages: 2,098

    Bowl vent?
  3. smokediver

    smokediver LawnSite Member
    Messages: 59

    That's a possibility I suppose, but why would it be confgured as a hose barb?
    It's one size smaller than the fuel line barb. I thought maybe a return line, but there's no flow. I thought the bowl vented into the throat of the carb, but I could be wrong.

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