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Old 02-12-2024, 02:38 AM   #11
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Thank you, mikracer. The pump is brand new, so I am hoping the pressure leak won't be in there, but I will keep this possibility in mind if nothing else solves my problem. --Glen

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Old 02-12-2024, 12:58 PM   #12
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Thank you, mikracer. The pump is brand new, so I am hoping the pressure leak won't be in there, but I will keep this possibility in mind if nothing else solves my problem. --Glen
You can pull that part of the pump off and check the plunger to make sure its not stuck. Easy to do and doesn't cost anything. If you aren't seeing any water leaking anywhere, this is probably the culprit.
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Old 02-12-2024, 09:03 PM   #13
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My shurflo started randomly cycling a few years ago...

I pulled it apart and found bits of plastic swarf in the pump from when the holes were drilled in the plastic fresh water tank. The plastic shavings were in the bottom of the tank and at some point got sucked into the pump.

Plucked out the bits and the pump has worked fine since.
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Old 02-12-2024, 09:29 PM   #14
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My shurflo started randomly cycling a few years ago...

I pulled it apart and found bits of plastic swarf in the pump from when the holes were drilled in the plastic fresh water tank. The plastic shavings were in the bottom of the tank and at some point got sucked into the pump.

Plucked out the bits and the pump has worked fine since.
I went to great lengths to get all those bugger plastic swarf bits out of my tank too. So far it appears none made it to the pump but even with compressed air and latter water flush it was tough getting them all.
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Old 02-13-2024, 12:52 PM   #15
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Make sure you check outside the van. The city water feed line on mine runs under the floor and is a pretty good candidate for freezing. Also, I once had the check valve stick on the city water fitting and water slowly leaked out of the cap, causing the pump to cycle; it was hard to see because it was evaporating almost as soon as it hit the ground.
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Old 02-13-2024, 09:40 PM   #16
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The fill valve is also a know weak spot for cold temperatures.

While this shouldn't be the OP's issue, as he replaced the water pump. I too became a victim of that cold spell. My original plan was to keep the heater on, I have a Truma Combi that takes propane and electric. I usually just keep on electric low and heat the van if it get cold at night.

That plan fell apart when the wind knocked out power. I could have fired it on propane, but decided to take the easy way out. I opened up the hat water tank, but could not open the tank drain as it was outside and already frozen. I was able to run water out of the faucet and shower and thought I did enough, power was out and my large air compressor was empty, so I couldn't blow anything out. I must have got a little water left in the pump, so after the freeze it just ran, but no water came out.

I took it a part and found this valve was stuck.


I took that apart and was able to free it up.





I put it back together and it works fine.

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