Yep it's the one way valve on the pump. Ours has done it once and I'm monitoring it to see if it does so again before replacing the valve or pump.
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Mike Nancy and the fuzzies
Fulltiming since June 2004
Volvo 660 MH tow vehicle
2005 MS 38RL
2007 Saturn Ion "toad"
2010 Gold Wing "piggyback"
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