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Old 04-16-2013, 05:39 PM   #1
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Water tank draining

So we bought our first RV, a 1999 Winnebago Chieftain 33B. It's in fantastic shape. I'm in the process of sanitizing the water tank IAW the owner's manual. Step 1 is to drain the tank. I opened the drain valve and the water is draining out SLOWLY. It's not even a solid stream. According to the previous owner, that is normal. I opened the gravity fill door hoping it just needed air but nothing changed. I used a long, skinny screwdriver to probe the drain valve through the discharge line but didn't find any obstructions. My next step is to disconnect the hose at the outlet of the tank and look for debris. Before I do that I wanted to ask if the slow drain is normal. I sure hope not. Thanks!
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Old 04-16-2013, 05:54 PM   #2
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Opening the exterior water fill cover/cap and opening a faucet inside will allow more air to enter the tank. If release pressure is still slow, suck on the hose as if siphoning fuel. Works for me.
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Old 04-16-2013, 08:48 PM   #3
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Opening a faucet didn't help.

I went ahead and took off the hose on the other side of the drain valve and hooked up a length of rubber tubing to the valve. This allows me to see the flow through the valve when it's in the normal flow position. The water drained out in a solid, full stream. At least I know the normal water flow isn't being impeded.

As for the crappy flow when the valve is in the drain position, that's a project for another day.

Thanks.
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