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Old 05-12-2023, 03:21 PM   #1
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2019 25' Flying Cloud
Decatur , Georgia
Join Date: May 2021
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Shurflo help

Having trouble with the Shurflo 4008 in my 2018 FC 25 FBT.

First dry camping trip out after dewinterizing. Pump runs continuously at a very low, almost inaudible level. Gets louder when I run the tap, then “shuts off” but is still running just a few db above background. Occasionally if I run the cold water a couple seconds it will get louder then totally shut off like normal. If it starts the “quiet” running it won’t pressurize and silence on its own, it will keep “quiet” running until I turn off the pump or run the tap to “force” it to pressurize and stop.

Water flow is intermittently weak, seems like more air than it should have. Totally normal from city water. If I pressurize the lines with city water then turn off city and turn on the pump it holds pressure, which seems like it would rule out a leak on the output side. In any event, I can’t find any leaks anywhere in the cabin. Confirmed low drains are closed. Removed the inlet/output lines from pump and reseated, pump initially pumped to pressure then stopped but now repeating same pattern.

Also - the screen with the clear lid has no water in it. I took the lid off, no debris etc. Seems like it’s not pulling from the freshwater tank.

Do I keep hunting or should I replace the pump at this point?
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Old 05-12-2023, 07:21 PM   #2
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2018 25' Flying Cloud
Portland , Oregon
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Quote:
Originally Posted by starlite29 View Post
Having trouble with the Shurflo 4008 in my 2018 FC 25 FBT.

First dry camping trip out after dewinterizing. Pump runs continuously at a very low, almost inaudible level. Gets louder when I run the tap, then “shuts off” but is still running just a few db above background. Occasionally if I run the cold water a couple seconds it will get louder then totally shut off like normal. If it starts the “quiet” running it won’t pressurize and silence on its own, it will keep “quiet” running until I turn off the pump or run the tap to “force” it to pressurize and stop.

Water flow is intermittently weak, seems like more air than it should have. Totally normal from city water. If I pressurize the lines with city water then turn off city and turn on the pump it holds pressure, which seems like it would rule out a leak on the output side. In any event, I can’t find any leaks anywhere in the cabin. Confirmed low drains are closed. Removed the inlet/output lines from pump and reseated, pump initially pumped to pressure then stopped but now repeating same pattern.

Also - the screen with the clear lid has no water in it. I took the lid off, no debris etc. Seems like it’s not pulling from the freshwater tank.

Do I keep hunting or should I replace the pump at this point?
Very strange for sure. Confirm the water heater plug is in, bypass valve isn’t open, relief valve is closed, etc. I mention that because you said it just coming out of winterization.

Otherwise, replacing the pump would be my next step. If that the original pump it’s probably due anyway and isn’t expensive as RV things go.
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Old 05-12-2023, 07:42 PM   #3
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2017 25' Flying Cloud
Longmont , Colorado
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We had a similar issue one year after de-winterizing. Problem turned out to be a crack in the clear plastic cap on the input screen filter. Pump was sucking air along with water so it was acting very strange. I always winterize with air and forgot to run the pump dry I think. $10 part fixed it.

https://www.amazon.com/SHURFLO-255-3...356877564&th=1
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Old 05-12-2023, 10:06 PM   #4
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The heads on these pumps can be opened for cleaning. Quite possible that very small piece of debris or build-up is keeping the check valve from fully closing or causing some other similar problem. If that doesn't fix it and you're sure there are not leaks on the intake side between the pump and the tank then replacement would be my next step.
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Old 05-15-2023, 09:53 AM   #5
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2019 25' Flying Cloud
Decatur , Georgia
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Solved it. Clear strainer lid does not have o-ring, seemed hand tight however when I tested it with air it was leaking. Tightened with a wrench and all good now.
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