I have a 1hp jet pump goes 20-40psi. A couple weeks ago I just lost all water pressure in my trailer. Went down the pump was working but no water. Pressure at 0. Checked the bladder it had no pressure. Put pressure in it at 18psi. We fixed every and any leak we could find. Primed the pump and can get pressure up to 20-23 psi until we open the valve to the house then it goes straight back to 0. Never gets up to 40psi when valve is closed either. Idk what is wrong with it. I can't afford to have someone come out to fix this, I have to fix it myself. and I live in a part of town that can not get municipal water. If anyone could give me ideas to try I would appreciate it.