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Old 11-29-2014, 11:29 AM   #1
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Potable Water

We are camping, hooked to the park water supply. We have never put water in the potable tank, however this morning water was all over the ground. It was coming out from behind the potable water cap. How did this tank fill up and how do we keep it from filling again ?
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Old 11-29-2014, 11:54 AM   #2
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There's a check valve between the tank and the water pump. When you're on park water, the park water pressure back-seats the check valve, preventing water from entering your potable water tank. (Sometimes this check valve is incorporated into the water pumps suction line, rather than being a separate valve in the suction hose.) It's probably leaking backwards. Try turning off the city water, turn on the water pump, and pump some water from the tank through the faucets. This should clear anything out of the check valve and let it re-seat. If that doesn't work, then your check valve is probably broken; you'd need to replace it.

In the meantime, if flushing the check valve didn't work: If your unit has a connection that allows you to pump antifreeze from a jug, then you may also have a valve between the tank and the pump that you could close to stop the back flow. Usually there is a Tee in the suction line, with a valve between the tank and the Tee and another valve between the antifreeze suction connection and the Tee. In this case, close the valve between the tank and the Tee.

I understand that some units have a 3-way valve instead of two valves and a Tee. In this case, the valve lines up the pump suction to either the tank or the antifreeze connection. If you move the valve position from the tank to the anti-freeze connection, the water will probably leak out of the antifreeze connection instead of the tank. It's possible that putting the valve in the mid-way position will stop all flow, OR it will route flow to both the tank and the antifreeze connection, depending on how the valve is constructed. I don't have one of these, so I can't tell you for sure what which way it will operate.
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Old 11-29-2014, 12:00 PM   #3
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I believe there is a check valve(one way valve) on the water pump. Your water lines T together right after that. So if that check valve goes out you could be backfilling the tank through the pump. Just for fun you might try running your water pump and the check valve might reseat its self.
Another guess might be that there is a leak right at the inlet and it appears to be coming out of the FreshWater fill. Pull the FreshWater dump valve to be sure the tank is actually full or just check your FW Level Lights in the trailer.
Are you using a pressure regulator on your water line? If not that could have caused the issue.
Good Luck; Campers are Fun…
John
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Old 11-29-2014, 12:06 PM   #4
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Here's a thread showing the valve in the pump.

Water coming out fresh water fill cap
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