Wextroll Amtrol pressure pump

That WX302 is a pressure tank, not a pump.
The correct precharge (with tank completely empty) is 2 psi less than pump cutin pressure.
IOW, if your pump starts when the pressure drops to 30 psi, you need 28 psi precharge. Remenber to turn the pump off and completely drain the tank before checking the pressure.
Ron
 
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