I just replaced an old Craftsmen shallow well jet pump with a Zoeller, same HP, but the pump is consistently switching off and on and not delivering 1/3 the flow it should. We set the new pressure tank to 18 PSI per the recommended factory 20/40 switch. However, we're pushing the supply to the house probably 300 feet horizontal and 50 feet vertical if I had to guess.
Roughly looking at it, I think the PSI is just too low. If it is 50 feet of head, that's about 21-22 PSI loss and I think the pump switch is just ineffective due to the line pressure being high enough. Does that sound about right?
The guy at the customer support said it didn't matter and maybe it was because my pressure switch is too far from the tank, but it is only about 2 ft because its mounted on the pump itself from the factory.
Any advice would be greatly appreciated, been banging the head for 4 days now.