Instructables
Introduction

I have a number of rain water tanks which I use to water my vegetable garden during the summer. I have a cheap water pump that has been working faithfully for the last 4 years but this year, when I turned it on for the first time, I got no pressure regulation, the pump was running flat out and water was pouring out of the electrical control box. Not cool!

The electrical control box is the size of, say, three decks of cards stacked up. It contains the electrical terminations for the power cable and the pressure switch. The pressure switch is used to set the operating pressure of the water pump.

To provide the capability of measuring the water pressure and switching the power to the motor there is a mechanical connection between the water and the electrical components. This mechanical connection is provided by a rubber diaphragm which allows the mechanical components to move but does not allow the water to escape. Well normally that is true. In this case the issue was that the diaphragm had perished and ruptured. Hence water flowing vigorously through the electrical switch gear.

I priced a replacement pump and a replacement pressure switch. The switch was the price I paid for the pump in the first place and a replacement pump was twice what I had originally paid. So I decided to have a crack at fixing the thing.  This instructable is what I found and how I repaired it.
 
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fishph0510 months ago
Good article, and great job!
FieldingBlue (author)  fishph0510 months ago
Thank you sir. I try.
I like the duck.
FieldingBlue (author)  GonzoandHappy1 year ago
He's a bit of a character that's for sure.
jimmyf1 year ago
Excellent Job! Clear, concise and well made 'able.
FieldingBlue (author)  jimmyf1 year ago
Thank you. 8D
thebear11 year ago
you are welcome
thebear11 year ago
great job on repair , tip buy a box of round tire patches from a auto suppy or parts store
they will work, come in diff sizes i have used these for diff repairs
god bless
FieldingBlue (author)  thebear11 year ago
Nice tip. I hadn't considered that technique. Thanks
This is awesome! You should post a picture when your veggies come in, I bet you will have even more!
FieldingBlue (author)  audreyobscura1 year ago
I think I'll do that. Thanks.