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On the sailboat I've got the Whale fittings everywhere, and there are a few between the tanks and the 4 way selector valve feeding the pump. Even with the Jabsco there have been problems, particularly with one tank. I chase around and and wiggle or disconnect-reconnect the fittings and get it to...

Well you have confirmed by suspicion that the suction side has to be truly vacuum tight. Even the typical Whale shark-bite type quick connects aren't vacuum rated. I think the accumulator probably contributes to the priming issues because it can develop very little pressure when dry, and has to...

IStream, how much delay do you get when turning on a tap? And where is your pump in relation to the tank? This is only annoying to me when taking a shower, as I have the trigger shower head. Pull the trigger and there is a momentary droop in pressure. It has varied a bit and seem to do with any...

My experience with normal pumps w/accumulators, Jabsco variable speed, and Marco variable speed (currently have all those setups in one thing or another).  Normal pump with accumulator works, but there is pressure variation between the cut in and cut out point, and the accumulator does not...