My first thought is the accumulator tank is water logged and needs to be pressurized or replaced.
Another possibility is that your pump should not be connected to an accumulator tank. Some Jabsco pumps are variable speed and shouldn't be used in a system with an accumulator tank. It seems to confuse them. You can look up your pump on the Jabsco website or just post the model number here and I can tell you.
It might be the pressure switch, but probably not. They usually fail either off or on, not switching on and off.
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Parks Masterson
Retired from Hopkins-Carter Marine Supply
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