Question about 1980 Suzuki Gs 550 L

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My issue with my bike is constant fuel overflow, even after the bike is shut off fuel keeps running out. A little back history. The bike has sat for 26 years in a shed. I took the carbs apart and cleaned them and replaced gaskets and float bowl plugs. After getting it put back together it fired right up, ran good, then when it was shut off fuel continued to flow out the petcock until its literally on the floor of the garage. I've considered replacing the petcock for a manual shutoff type. Your thoughts?

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Make sure the petcock is NOT in the PRI,or prime, position. This will open the petcock causing fuel overflow.

Posted on Mar 03, 2015


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YES, replace the petcock.

Posted on Feb 16, 2015


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Your petcock needs to be rebuilt (if parts available), or replaced, if it does not shut off the fuel. It also may not be saving reserve fuel , if gas is bypassing the ON position. You may also need a new fuel filter .Maybe add an additional in line filter. If you have replaced the float needles and the carbs are still overflowing you probably have a problem with rust in the tank. Have the inside of the tank cleaned or use a rust removal kit on the tank and see if this does not solve the problem. Try to avoid fuel tank liners if possible , they can cause more problems than they solve.

Posted on Jul 02, 2010

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the only thing i can suggest, is a sticky needle and seat, if fuel is coming out the over flow, then the float is not shutting off the fuel running into the carb, it has to go some where, so it comes out the overflow. Pressure in the tank wont have any affect at all with your problem. I would take apart the carby again, and check and clean the needle and seat.
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