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You won't necessarily see much when you look at them. If they're leaking, it's because they don't seal properly when the fuel level makes the floats rise. They may be dirty, or they may be worn at the tips or at the seats, or they may not be moving freely.
The float valves can't leak fuel into the engine when parked if the vacuum operated petcock is working properly, so if it's happening, both the petcock and at least one float valve is leaking.
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