Check your water pump screws...

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Well-known member
Dec 2, 2018
Yesterday, in a California SP campground, our Shurflo 4008 water pump pumped some air, then ceased pumping water while I was doing dishes, but continued to make noise.

Investigation showed that all 4 of the stainless steel screws that hold the pump body to the motor casting had vibrated loose and fallen out. I pulled the pump, reinstalled the screws, and reinstalled the pump and everything seems to be OK.

One screw had stripped part of the casting threads, so I had to remove one washer to get it to grab.

The way the casting is made, a person should be able to install longer screws, and jam nuts or lock nuts on the other side to keep this from happening.


Well-known member
Sep 28, 2018
Rene T said:
Or use a drop of blue locktite.

While I agree about using the Blue loctite ....Be careful not to use the Red Loctite, unless you have no plans to remove the screws

Rene T

Site Team
May 20, 2011
Farmington NH
I had the screws holding the inside diaphram to the pump housing years ago. Must have been a freak thing because I never heard of it happening to anyone else.
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