There has to be a check valve, because the manual pump would just pour water through the electric bilge pump without one. Chances are pretty good that the problem is that the water in the output hose, on the other side of the check valve might be causing enough back pressure to prevent the check valve from opening.
It is a pretty common fault on check valves.
BTW, it is also basically the way a diaphragm pump works... it's just two check valves and a bellows...
check to see if there is a check valve in the line, it might be clogged and/or stuck. with both pumps using the same line i would think there is a check valve on the electric pump side
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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