There is no overfill valve, if you fill it to the top of the tank fill hose it shouldn't leak, i do regularly (no topping off my ass). If it is leaking next time you fill it get a mirror on a stick and a flashlight and start looking for the leak, if it only does it when its full you might be lucky and just a have a crack in your tank fill hose instead of a crack in your tank. Good luck
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