Check out some similar questions!

dad_151 · Nov 26, 2012, 01:48 PM

What happens when You turn the screws and it won't pump more than forty pounds

jlisenbe · Nov 26, 2012, 05:53 PM

Dad, you are posting on an old thread.

speedball1 · Nov 27, 2012, 07:21 AM

Hi Dad and welcome to The Plumbing Page at AskMeHelpDesk.com You are responding to a 8 year old dead thread so I gave you one of your own. Please check the date before you post. Thanks,

What happens when You turn the screws and it won't pump more than forty pounds

Replace the control box.and see if that doesn't solve your problem. Good luck, Tom

jlisenbe · Nov 27, 2012, 01:41 PM

My apologies, Dad. I thought you were commenting on the previous discussion. After reading your post a second time, I see you were asking a question. Glad Speedball saw that.

If you turn up the main center nut and the pump just keeps on pumping but won't get past forty pounds, then there is a problem outside the box (possibly the pump). If the pump gets up to 40 and then cuts off, and you can't get the control box adjusted any higher, then you need, as SB said, to replace it.

speedball1 · Nov 27, 2012, 03:11 PM

The contacts never open up and the pump keeps on running? Or do the contacts open up at 40 PSI? At first I thought it might be a bad control box but I'm leaning more to a damaged impeller or perhaps a leaky check valve. Can you give nus more details? Back to you, Tom