My rear port side pump sometimes is air locked at start up. If I reach down and lift and/or jiggle the intake hose a bit, it will then "load" with water and begin pumping. I normally fill my fat sacs with the engine off. Interestingly, with the engine running, the starboard side picks up too much air from the exhaust, while the port side doesn't. Since it would take the starboard side longer to fill with the air getting in, I turn the engine off while filling.
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