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If you unplugged it and it still ran, it sounds to me like the pump is
connected directly to the battery through a relay which is switched
by the fusebox switched connection, and the relay is sticking.
You sir are a smart feller! I put it up on a rack and opened the bottom hatch door yesterday and wouldn't you know it... the relay was corroded and as soon as I unplugged and replaced..it is working just fine. Thanks again for the electronic advice!