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By isolating the pressure tank from the well pump, there was nowhere to store pressure produced by the pump, resulting in the pressure to rapidly drop to 0 once the pump was shut down. You're right - the flaw in my theory was that the drop pipe would maintain the pressure built by the pump...

The casing is 6" so no issue there. I put the last pump in 17 years ago and I'm old enough to know I don't want to do another one 17 years from now ! I try not to go out of my way to waste money (failed here, obviously) but I have zero interest in a inexpensive, low quality pump. I did read a...

Would this A.Y McDonald 6630-255 be a better choice ? Or am I completely misunderstanding what you guys are telling me. I do appreciate your patience, thank you.

Excellent, thank you so very much. Now...anybody wanna buy a Grundfos 15SQ05-110-115v ? Only used on Sundays, previously owned by a little old lady from Topeka, real cream puff I tell ya'.

And that is really the rub. The gen set is an inverter, 3 cylinder diesel in the basement, weighing in at 485lb. It's modest at 7.5kw and has two 120v 30a circuits, but because they are the same phase, there is no 240v. So if I convert the well to 240v, I'll have no back up. I really...

It was far from cheap and yes, you are correct, I chose the wrong pump for this application. I understand I can compensate for this pump by adjusting the cut in/cut out to 10/30 as Valveman has suggested, but 10 psi sounds like an abysmally low fixture pressure before the pump kicks in.

The pump is set 9' from the bottom at 128' from the surface and there is 40' of water (static) above the pump, 1 1/4 poly pipe. I am limited to 120v due to the back up generator. I think the 10SQ05-200 would be...

There is no leak at the adapter and there is no sound when peering down the well casing. I'm assuming at this point if there is a hole in the pipe, it's below the water surface. To be clear, if there is no leak, this pump should be able to produce more than 38 psi at 128 feet of head, correct ?

Good day all, I have recently installed a Grundfos 15SQ05-110-115v pump and it won't build pressure past 38 psi. which does not allow the 30/50 switch to cut out. If you isolate the pressure tank (there is a valve on it) and isolate the house so that the pump dead ends at the switch/gauge...