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Old 10-12-2015, 10:48 PM   #1
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Leaking fresh water tank drain valve

Just came home from the last trip of the year. During my stay, I started to notice the water pump would cycle for a split second every 3 minutes or so. That tells me that water is coming out somewhere, somehow. I checked every fitting and fixture in and out of the camper. The only thing leaking very, very, slowly, was the fresh water drain valve. It's a camco threaded valve. Less than a year old. The fitting itself is leaking, not the threads. Anyone else have this problem and if so, solution? I was thinking something more solid like a brass fixture.
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Old 10-12-2015, 11:02 PM   #2
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Something like this
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Old 10-13-2015, 01:27 PM   #3
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I don't believe the tank is pressurized so a leak there would not cause the pump to run. The pump uses the tank as a resource to draw water from to pressurize the plumbing lines feeding the sink/toilet/shower
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Old 10-13-2015, 01:39 PM   #4
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Just to dbl check. Are you referring to the fresh water tank drain or the low point drains?

My comment above assumes the tank drain.

If you are referring to the low point drains then the pump could be cycling for that.

If you are not sure, run the pump then open the valve. I water shoots out under pressure it is a low point valve. If it just pours out then it is the unpressurized holding tank.
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Old 10-13-2015, 03:12 PM   #5
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As stated above, the fresh water tank drain valve leak wouldn't cause your pump to cycle. You have a bad valve somewhere after the pump. Either a sink, shower, hot water tank, or the toilet. Check the shut off valves and any connections near them. There is a chance you could have a small leak in one of the lines going to one of these as well. Even a slight drip in the sink will cause what you are experiencing.
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Old 10-13-2015, 07:28 PM   #6
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I will look again at all the fittings. Thanks
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Old 10-13-2015, 10:31 PM   #7
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Don't forget outdoor shower, outdoor kitchen if you have those
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Old 10-14-2015, 10:00 AM   #8
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If your pump cycles and you can't find a leak--it could be a leaking internal check valve in the pump itself allowing pressure loss and the pump senses it and kicks in. Sometimes a quick full-opening of a faucet will dislodge the dirt that may be in the check valve. I have had to replace several Shurflo pumps because of this leakage but no water use noted/tank never goes down. Sometimes this will be accompanied by the FW tank filling while on shore water supply.
Hope you find out what is going on--let us know.
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Old 10-14-2015, 10:36 AM   #9
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I checked everything again. No leaks. My next thoughts were like wingnut said. Bad pump? Or open the panels under the camper to check the water lines?
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Old 10-14-2015, 10:59 AM   #10
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If you have a cutoff valve on pressure side of pump, use it to see if the pump still cuts on. If you don't have that valve, consider putting one just downstream of the pump--using it would pinpoint whether the pump is losing pressure, or there is a pinhole leak somewhere that doesn't show enough water to notice.
If you aren't losing water from the tank enough to notice, might just be an irritation to put up with considering the cost of a new pump...
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Old 10-14-2015, 11:13 AM   #11
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Don't forget the valve to fill the fresh water tank from city water if you have one. If it is leaking the pump will cycle.
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Old 10-14-2015, 01:08 PM   #12
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I'm thinking the same. I spoke with shurflo tech support and they said sounds like a dirty/bad check valve. Thought this pump was replaced 2-3 years ago but no, its the original. 11 years old. I will try to get this one fixed myself (peace of mind) and I will order a new one for replacement.
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Old 10-16-2015, 10:45 AM   #13
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Findings: I took the pump apart and found nothing out of the ordinary. Re-installed the pump with the output hose blocked off. This way I can isolate the whole water system. I pressurized the pump and it still cycled every 1-3 minutes for a split second. This confirms the pump is bad. No use trying to fix it since it's 11 years old. I hear (no pun intended) , the new revolution pumps are much quieter. This also gives me the opportunity to install an accumulator tank. This cuts down the use and noise, especially at night. Thoughts?
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Old 10-16-2015, 10:11 PM   #14
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Should you go that route with the accumulator tank I would really like to hear how it comes out. I think I would like to try that myself.
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