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Old 03-12-2016, 08:16 PM   #15
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2013 25' Flying Cloud
Wheaton , Illinois
Join Date: Aug 2014
Posts: 392
Currently, my fresh water tank slowly backfills from the city water supply (takes about 10 days) due to a faulty check valve in the fresh water pump. So, there is city water pressure at the output side of the fresh water pump.

I would think it would be somewhat simple to build a bypass around the fresh water pump, similar to what is used to bypass the hot water heater when winterizing. Whether there is room to fit the additional plumbing or you have sufficient access to do this would vary on your model.

First noticed the problem when I saw a trickle of water coming out of the fresh water tank filler door. Full hookup campsites, didn't have the tank monitors on. Funny thing is that I just weighed the trailer a day before discovering the problem and was wondering where all the extra weight came from.


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Old 03-12-2016, 10:53 PM   #16
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1967 26' Overlander
Spartanburg , South Carolina
Join Date: Jan 2011
Posts: 385
Originally Posted by dannydimitt View Post
Our 66 AS was plumbed from the factory with a valve to fill the fresh water tank while connected to shore water source. Simply take the fill cap off while doing so if worried about a burst tank . 50 years of use and the valve and tank work fine .
Ditto our '67 Overlander. The outside fill cap is made so that it vents the tank so that neither pressure nor vacuum can occur in the tank. If it didn't, the tank would collapse as water is used.

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