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I second donradclife's comment. My pump did a similar thing and I couldn't figure out what was going on, so I redid the whole system from head over holding tank all the way to the fittings. while I installed a manual vacuum head (LaVac) for simplicity I installed a holding tank (sealand) with all connectors at the top (like yours) but installed a manual diaphragm pump to empty the holding tank. works like a charm and doesn't need electric, switches, breakers, rebuilding kits. Just one easy to replace spare part the rubber diaphragm. Just look at your system, perhaps you are able to simplify as well.