If in the past your system can build-up pressure up to 40 psi even if the supply valve is open and water is being used in your house, then your pump impeller maybe already worn out that's why its pumping capacity was reduced.
The bladder in your press tank is faulty. Change tank. Also, when you change tank, change the press gauge for a better one. Those cheap $8 ones are garbage.
Keep in mind that your pressure tank should be pressurized to 2# below your cut-in pressure as set on your press switch. It's also not a bad idea to change the press switch too. I prefer a 40/60 setting over a 30/50 setting.
SOURCE: Flotec Shallow Well Jet Pump won't pump water
The tank is an air tank, it works like a cushon and accumulator.
Have you reconnceted the pump? If not fill the pipe that goes to the well with water. It should not drain down, there should be a foot valve that prevents the water from running back into the well. So if the foot valve is working it should not take a lot of water to do this.
Pour water into the suction side of the pump until the pump is as full as you can get it, reconnect the pump and start it up. Yes it does need to be primed
Good luck
SOURCE: Cabin pump, primed fine only goes to28psi and keeps running
Sounds like the injector nozzle is plugged. This nozzle is directly inside the influent line on single line jets and down in the well on two-line jets. I'm assuming you have it primed correctly. If this happened suddenly the it'd definitely the injector nozzle. It it was a gradual process over time then I would say it's either a badly worn nozzle or worn impeller.
SOURCE: how do I know if my jet pump is going bad? It's at
I had similar problems it ended up being the shallow well it self. It did not have enough gallons per minute of flow to keep enough water flowing to allow pump to function properly. Some well drilling companies can clean out well or vanes to allow well to flow properly. Otherwise you will most likely need to drill a newer deeper well.
Testimonial: "Thanks, I'll look into having the well drilled deeper."
SOURCE: I replaced old pump w/
The water and therefore the pressure has to be going somewhere. If you are sure that there are no leaks in the house or outside, then the water is going back into the well. There is a check valve either in the suction line of the pump between the top of the well and the pump or down in the well.
If this check valve fails, it allows water to go the wrong way and back to the well. The result is that you lose pressure.
Secondly, you have to be sure that there are no air leaks between the top of the well and the inlet to the check valve. Leaks in that piping will make repriming difficult.
Write back with more and I'll try to help more.
Gary
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