So I have this sump pump [View all]

It's old, it works well, maybe losing a little power. Has a separate float switch. Pump sits underwater - forever.

Last week I dump 5 gallons of water in the hole, on the underwater pump, and the pump shorts out. Trips GFCI's, and makes the lights go dim for circuits without GFCI, though it does pump.

Today the pump is working fine again, no longer shorts GFCI's, works with the float switch or without.

No question for you, but this is inexplicable. The pressure of throwing 5 gallons of water on it caused a temp short. Now what.