Water Issue
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Senior User
Joined: May 2010
Posts: 320
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From: Illinois
Water Issue
So I was hooked up to a full hookup site the other day and notice my fresh water holding tank was dripping on the ground I keep the plug out of it when not in use. Is this a problem of some kind it my pump letting water by pass my city water connection? I mean it didn't really bother me much but will it make any other problems? 
FTE Legend
Joined: Jul 2005
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From: Millersville, MD
Depends on WHERE it is leaking..... you MAY have a hole in the tank itself. But most likely a loose clamp at a connection. Hopefully the tank is accessible. I would guess it's about time for winterizing anyway, right? Before you drain the fresh water tank, add a few drops of red food dye into the fill tube and look for the red tinted water coming out!
Elder User
Joined: Aug 2011
Posts: 858
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From: Chico,CA.
I think the check valve in the pump is leaking slightly and letting water back into the fresh tank. A dead give-away is to put water in the fresh tank and spend a night with the pump turned on. If it occasionally cycles, you've got your culprit. My last trailer did this. We were on full hook-up for a week once,and gained about 1/4 tank of fresh water. --- If you have a "power fill" valve (which allows you to fill the fresh tank while hooked to city water), it can leak and cause the same situation of water getting into the fresh tank.
Hotshot
Joined: Jan 2010
Posts: 10,060
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From: Bristol, TN.
If you have a back check valve feeding back through the pump, simply disconnecting the water line on the inlet side of the pump (the side from the fresh water tank), when the city water line is connected should serve to diagnosis the problem I believe. Failed back check valves in pumps are a rarity, in my experience. If so, it is a simple fix to add an inline back check valve to take the place of the one that has failed, rather than replace an entire pump or pump head.
My two cents worth,
Steve
My two cents worth,
Steve
Last edited by RV_Tech; Oct 13, 2012 at 05:55 PM. Reason: to clarify
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Senior User
Joined: May 2010
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From: Illinois
Thanks Steve I was hoping you would weigh in on this its pretty strange as i watched it with a few cold ones and it had a pattern to it like three drips then nothing then three drips then nothing always about the same time apart? Like I said I always leave my fresh tank unplugged when on city water so just noticed it last time out my next trip coming up ill be on tank water but with all faucets shut off would the pump still cycle if the check valve is going bad?
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Elder User
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From: Chico,CA.
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Hotshot
Joined: Jan 2010
Posts: 10,060
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From: Bristol, TN.
A pump will also cycle if air is getting into the line at a connection, which is actually the most common cause of cycling with everything shut off. Air is compressible and the most common place folks miss is at the pump inlet connection where it can suck water and air. Not making this up, have seen it dozens of times and is in the manufacturer's manual.
Steve
Steve
Steve
Steve
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