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Old 06-26-2020, 12:03 PM   #1
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Fresh water tank will not drain.

I have a new 5th wheel (Brookstone) and find the fresh water tank will not drain when I open the valves. If I turn on the pump water flows but without the pump the water will not drain. I am wondering if there is a venting issue?? Thoughts?

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Old 06-26-2020, 12:16 PM   #2
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My first thought would be the Overflow tube...which also works as a vent on a lot of tanks is either clogged with something, pinched off somehow or the manufacturer really messed up and forgot about a vent.
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Old 06-26-2020, 12:17 PM   #3
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Do you have a gravity fill? (Same as overflow tube)

If so, try taking a piece of cut off hose and pushing it up against the vent as hard as you can to seal it and then blowing in the other end. You should be able to blow easily into the tank. If you have resistance, it's likely blocked with water.. keep blowing. It'll clear.
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Old 06-26-2020, 12:25 PM   #4
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Old 06-26-2020, 12:26 PM   #5
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Originally Posted by SNFR666 View Post
I have a new 5th wheel (Brookstone) and find the fresh water tank will not drain when I open the valves. If I turn on the pump water flows but without the pump the water will not drain. I am wondering if there is a venting issue?? Thoughts?
I'm trying to figure out how running the water pump helps drain the tanks.
Which 'valves' are you using to empty the tank? There are red and blue ones that drain the faucets, then you have a separate valve that drains the fresh water tank. Usually emptying the tank is a matter of opening the valve and gravity does the work of letting the water out.
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Old 06-26-2020, 12:30 PM   #6
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Originally Posted by Reverse_snowbird View Post
I'm trying to figure out how running the water pump helps drain the tanks.
Which 'valves' are you using to empty the tank? There are red and blue ones that drain the faucets, then you have a separate valve that drains the fresh water tank. Usually emptying the tank is a matter of opening the valve and gravity does the work of letting the water out.
Pretty much how our Cherokee was. Red and Blue were "Low Point" drains and the FW tank had a valve of it's own.
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Old 06-27-2020, 01:03 PM   #7
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To me it almost sounds like the OP is trying to drain the tank through the faucets, anyone else get this impression?
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Old 06-27-2020, 01:06 PM   #8
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If you are draining it through the red or blue PEX lines that is not the water tank drain.
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Old 06-27-2020, 01:20 PM   #9
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To me it almost sounds like the OP is trying to drain the tank through the faucets, anyone else get this impression?
Yup. That's why I was
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Old 06-27-2020, 02:31 PM   #10
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There should be a sticker on the side or in the water bay of the rv telling you where the fresh water drain is. On mine with the bedroom slide extended I have to crawl under to reach the drain.
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Old 06-27-2020, 05:02 PM   #11
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FWT

A single drain valve under the "Fresh Water Drain" sticker. Pump would only help if using Low Water drains, it will not pressurize fresh water tank.
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Old 06-28-2020, 06:18 AM   #12
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If you have a wet dry vac take and make something to fit the end of the hose and tank and see if it will suck it out or take the other end and blow air into it
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