I have an older (15-20 years) Sears Well Pump (Shallow single pipe in the well, about 20 or so feet down). Model on the pump says 390-252100. Lately it will only come up to about 40-42 psi and stick there... I think it was set at 30-50 on the pressure switch.
I pulled it apart and took off the diffuser. It looks like the end of the impeller and the hole where it goes into diffuser are worn. When I hold the diffuser over the impeller it will wiggle around... Is that supposed to be a tight seal there? Would that cause my problem?
Any help would be greatly appreciated!