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BonesD 02-04-2021 01:37 PM

Fresh Water supply pump intermittent
Howdy, my fresh water pump fails to come on from time to time. I found one suspect power connection and repaired but in the past if I just gave the pump a wrap with a screw driver it would run properly for months and then fail again. The vibration could be enough to have woken up the poor connection or might it be an internal failure.?
My question is if it fails in a similar fashion after repairing the one connection today, is there maintenance of any kind besides impeller replacement?
Pump is a Shurflo 2088-423-344. Thanks

Bill V 02-04-2021 01:50 PM

Looking at the pump and seeing it has a pressure switch mounted on it I suspect dirty or worn switch contacts. Do you have a pressure tank accumulator installed? Pump should run up to 55psi before shutdown and come on at 25psi.

O C Diver 02-04-2021 02:01 PM

Well of course you're having problems, your boat is pointing straight up (your avatar is 90 degrees off).

By a spare. When it bothers you enough, swap it out.


BonesD 02-04-2021 03:02 PM

Thanks for the input.

fgarriso 02-04-2021 04:54 PM

Buy a 120VAC water pump and run it off your inverter.

BonesD 02-04-2021 06:47 PM

I donít have an inverter.

C lectric 02-04-2021 08:12 PM

I will wager the switch is a snap switch OR *Micro switch*. They are not terribly long lasting in this application. The contacts will burn causing what you are experiencing.

It is the turning off that burns the contacts.

A new switch should be available from the mfgr. through the local chandlery.
Buy two and keep a spare.

THe pages posted above show the parts available and the switch is part of it although it looks like the sw. may not be available by itself. ASK if it is available by itself.

BonesD 02-04-2021 08:28 PM

Thank you, I will take a look.
Much appreciated!

Lepke 02-04-2021 08:44 PM

1 Attachment(s)
If you take the front of the pump apart (easy) you'll find a common micro switch found in many appliances. I will look similar to the picture. Do a search for the number printed on the switch. It will cost $3-5.

BonesD 02-05-2021 12:31 AM

Excellent, thanks all.

tiltrider1 02-05-2021 03:25 AM

Does the motor have brushes? Stuck brushes or stuck micro switch are the two failures that would respond to a thumping. In my book the pump has put you on notice that it is ready for retirement. I would replace it rather than being inconvenienced.

FF 02-05-2021 06:27 AM

IF you can, install a large 6 to 20 gallon accumulator the pump will not need to operate as often .

catalinajack 02-05-2021 08:52 AM

Yup, if one has the space, a Grundfos, with its own internal tank, is a bullet proof solution to all fresh water problems. It delivers 55 pounds of pressure and at far more volumes than one could ever use aboard a boat. Never suffer pulsating delivery and low pressure again.. Overkill, yes, but so what. The damn thing works and won't ever fail. It is designed to be a booster pump on farms and summer cottages that draw water from lakes.

Originally Posted by fgarriso (Post 972438)
Buy a 120VAC water pump and run it off your inverter.

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