Wells

Let's assume that your pump is getting up to some set pressure and cutting off rather than just running constantly. If that is the case, then the switch is the next place to look. Remove the grey cover. There are two nuts. Turn the larger, center nut clockwise (with the breaker off) a full turn. This will increase both the cuton and cut off pressure points. Turn the power back on and see what you have. Keep adjusting until you get what you want.

Be aware that the little tube leading to the switch can clog and cause the switch to turn off/on sluggishly. Checking that tube is a little more trouble but might be worth it.

Where are you measuring the pressure and what is it when the pump turns off? Whole house filter?

Whole house filter. Good question.

Whole house filter. Good question.

The reason I asked that is that the well at our mountain home has iron from the soil and if I don't change the filter every 6 months or so, I have great pump pressure but low flow. Pop in a new $3 filter and flow is great.

It is the first place to look. Glad you thought of it.