man, I had the same problem and it turned out to be a leak in the inlet seal. I had already chopped up my pump so it wasn't under warantee, I tried a ton of things to fix the seal. I wound up filling the pump with a plastic enamel it worked for a while then stoped working all together. Because i filled it with enamel I couldnt take it apart to fix or replace any parts. If I were you I wouldnt fill it with enamel and I would get it serviced. If you need to find the leak put the pump under water and plug one end of tubing and blow into the other. Air bubbles should come out of the leaking area.
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Air cooled my ass.
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