Your problem may be complex, but I think that if water shoots out while the pressure gauge says zero, your pressure gauge is bad.
Try putting a garden hose thread pressure gauge on the drain valve, and see how the gauges compare.
https://www.menards.com/main/plumbi...swivel/wspgh100/p-1841405562218774-c-8672.htm and https://www.homedepot.com/p/Water-Source-Water-Test-Pressure-Gauge-WSPGH100/308724108 and https://www.acehardware.com/departments/plumbing/pumps-and-pump-parts/pressure-gauges/4509477 are 0 to 100 psi, which are better than 0 to 200.
Try putting a garden hose thread pressure gauge on the drain valve, and see how the gauges compare.
https://www.menards.com/main/plumbi...swivel/wspgh100/p-1841405562218774-c-8672.htm and https://www.homedepot.com/p/Water-Source-Water-Test-Pressure-Gauge-WSPGH100/308724108 and https://www.acehardware.com/departments/plumbing/pumps-and-pump-parts/pressure-gauges/4509477 are 0 to 100 psi, which are better than 0 to 200.
Last edited: