The sender unit is on top of the port tank just behind the engine room wall in the cockpit. It is leaking pretty bad when we fill the tank. I can't quite see it. Does anybody know if it is shallow enough to be lifted out the top to be fixed. It has three screws and I'm guessing an o-ring seal. The gauge still works fine. The vent hose to the cockpit is clear so I don't think I blew it up on an overfill. That hose used to overflow fine. Anybody change one?