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Old 05-13-2012, 07:35 PM   #1
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Water Pump just runs and runs On 8312ss

Any ideas on why the water pump will continue to run and run. If I run water long enough it will run and shut off normally. However, if you run a faucet for like 5 seconds the pump will turn on but never fully prime and it just hums along until I open a faucet and let water run long enough for it to prime and shut off. I tightened the plastic strainer cap and made sure all connections around the pump were tight. I don't have any water leaks that I am aware of.
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Old 05-13-2012, 07:41 PM   #2
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Once the pump builds pressure does it stop and not come back on (or burp) until you open a water source? I would think maybe a bad check valve, bleeding off pressure or a crappy pressure switch. Be nice to put a pressure gauge on it and see what it's actually doing. If everything is proper it should kick in and quickly pressure up when you close the faucet. I just installed an accumulator today and it really makes a difference. You've got a pressure control problem somewhere. May have to try one at a time unless someone here has had this exact same situation. Good luck.
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Old 05-13-2012, 07:59 PM   #3
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This sounds to me like a check valve problem. A slight pressure drop will not allow the check valve to seat and it lets pressure bleed back into the fresh water tank. A large demand may compress the spring enough to slam closed when the faucet is shut.

I am thinking the check valve internal to the water pump.
There may be a rebuild kit available depending on the model.
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File Type: pdf 108554 Water Pump Backup.pdf (295.4 KB, 38 views)
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Old 05-13-2012, 09:25 PM   #4
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When I run a faucet long enough the pump will prime and eventually shut off. It will not turn on agin until a faucet is turned on or toilet flushed.faucets seem to spit a lot until pressure builds back up. I just came out of my 1 year warranty but do have the 2nd year through Forest river. Would a pump be covered? Tks
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Old 05-13-2012, 09:32 PM   #5
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Don't recall off hand on the pump coverage but I would give the dealer a call, if you like them, etc. and see what they say. You definitely have a valve or pressure switch problem or both. If it was leaking down it would "burp" every so often, but apparently it's not doing that. Correct? It's a little strange as it sounds like it is loosing pressure but not activating the pump until you put a good drain load on it like a faucet open. I'm with Herk, it's definitely at the pump in some fashion. Check valve, pressure switch or GREMLINS.
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Old 05-13-2012, 09:43 PM   #6
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Sounds like our water pump last season. Our pump would continue to run until we ran a faucet for a bit and it would stop. Didn't do anything about it but this season the pump is working properly. I don't know if going through the winterizing / de-winterizing process had anything to do with it but it works great now.
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Old 05-13-2012, 10:53 PM   #7
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Quote:
Originally Posted by cecilt View Post
When I run a faucet long enough the pump will prime and eventually shut off. It will not turn on agin until a faucet is turned on or toilet flushed.faucets seem to spit a lot until pressure builds back up. I just came out of my 1 year warranty but do have the 2nd year through Forest river. Would a pump be covered? Tks
Then its not the check valve. This is an air leak on the suction side.
It could be at the fresh water tank hose connection; a pinhole in the hose itself (screw maybe); the inlet to the pre-screen filter; or the screen filter to pump connection.
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Old 05-13-2012, 11:05 PM   #8
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Quote:
Originally Posted by cecilt View Post
When I run a faucet long enough the pump will prime and eventually shut off. It will not turn on agin until a faucet is turned on or toilet flushed.faucets seem to spit a lot until pressure builds back up. I just came out of my 1 year warranty but do have the 2nd year through Forest river. Would a pump be covered? Tks
Make sure that the valve on the short "winterizing" hose is closed. (don't ask how I know)
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Old 05-13-2012, 11:06 PM   #9
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I would guess the pump itself needs a new diaphram. If it was on the inlet side, the pump wouldn't know it, would it?
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Old 05-13-2012, 11:08 PM   #10
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I have the same darn problem

http://www.forestriverforums.com/for...tes-22807.html

Posted in the link above. The OP states the problem more clearly though.

I still have not resolved the issue.

When this occurred, I examined the pump and noticed the water filter had an air bubble. When the water pump worked properly, there was not an air bubble present. We don't use the water filter, so plan on removing it. Hopefully that cures the problem, if not we plan on replacing the water pump.
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