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Click this link to pull up a diagram - http://www.pumpvendor.com/Jabsco_82400-0092_parts.html
The pressure switch is what turns the pump motor on and off. It's the job of the check valve portion of the pumps valve body to maintain water pressure within the pump, and keep water from draining back to the storage tank. The most likely issue here is there is some mineral buildup on the check valves, and that is what is causing water to leak back to the tank. (causing the drop in pressure and causing the pump to turn on)
That being said. It's a 140 dollar pump. In the shop labor would outweight the cost of the pump, so we wouldn't screw around with it and we would simply replace the pump. However, if you are working on this yourself and your labor is free..... You could try getting a jug of basic white vinegar, and plumb the pump so it draws from jug of vinegar, circulates through the pump, and dumps it back into the jug. And just let it run. Vinegar does a fairly decent job of dealing with mineral buildup. If that doesn't do it, you can order a replacement valve body. That runs about 30 bucks and you can order it from the above link.
Does that all make sense?
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