What causes my booster pump to increase pressure even after I shut power and or water supply off?
My pump continues to increase pressure even though the manufacture states it is pre-set for 65psi max. This is causing it to leak from the bottom of the pump case, therefore I shut the power off and water supply and pressure still increased 100+ psi. Incoming pressure is 4 lbs psi
Garden - Grundfos - MQ3-45 1 HP Pressure Booster Pump
Answers & Comments
This is completely illogical. When you turn the power off it can't build any more pressure if the power switch actually turns off the pump.
The only thing I've read is where a bladder type pressure tank has a very small leak in the bladder, the pressure can go up slightly, 10 psi or so.
If you open a water faucet, can you tell that the pressure has risen vs while it's pumping at 65psi? At almost twice the pressure there should be a noticeable difference. If there isn't, there may be something wrong with the gauge itself.
Something wrong here. your incoming pressure is 4 psi ( tank pressure to the pump and you use a pump to boost pressure to a maximum of 65 psi at which point the pump is shut off ( all taps close off)
yet with no pumps running the pressure goes up to 100 psi
Find where you are getting pressure in that is making the pump leak
if you have 100 psi to the pump when it is turned off, then it would not be turning on ( power on) as the shut off pressure is set at 65 psi and the line pressure is 100 psi