My gould pump won't cut off after 40 psi

SOURCE: gould 1/2hp submergible well pump cycles on and

My first thought was that of a water logged tank which causes short cycling, from your notes the tank is good (the tank may be partially water logged though) If the tank is ok and your getting short cycling (and the switch is good) I would guess your check valve down the well has failed. As the pump creates pressure then shuts off the water may be going right back down the well causing the pump to cycle again. This could also account for the poor water pressure as the check valve may be stuck slightly open allowing the system to loose pressure but only allowing a small amount of flow by when running. There could be a leak within the pumps drop-pipe and your loosing pressure through this leak. I expect you'll have to have the pump pulled.
I hope this may have helped,
Tom

SOURCE: Gould Water pump Problem

sounds like cavitation in the pump due to the introduction of air. Check for leaks or cracks in the suction line so air isnt being induced into the pump.

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: I have a pump that will not pump higher that 40

The Goulds J5S pump is only rated for 40 psi. Is it possible that is the correct operating pressure? Did you get a higher reading in the past?

RJ H2O

• 311 Answers
• Posted on May 30, 2011

SOURCE: my jet pump has a 20 - 40 pressure switch but

There are several causes for this to occur.
1. If it is a 20-40 switch right out of the box it may not be set correctly. I have had this happen. If it builds to 30psi and shuts right off without straining to build to 40psi adjust the Cut-Out pressure up to 40psi. There are two different adjustments on a well switch. One for Cut In / Cut Out psi and one for Cut Out psi.
2. Lack of head pressure being built by the pump can be the cause. This can be attributed to the wrong Jetting in the pump. IE: A shallow well jet/venturi on a deep well.
3. The pump may have a bad impeller, but the pump will generally really strain to build pressure and a bad impeller will be loud, like grinding at times.
4. Double check the pre-set pressure in bladder tank also.
RJ