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Old 10-05-2012, 02:43 PM   #1
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Overflowing Freshwater Tank

The freshwater tank overflows through the fill tube when attempting to fill. I drain the tank the am only able to add 5-10 gals, (100 gal tank,) before it overflows through the fill tube, not the air vent. After some back surge you can see the water just sitting there. I have had the 5th wheel for several years and have never had this problem. Any thoughts?
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Tom
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Old 10-05-2012, 02:46 PM   #2
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Perhaps the fill tube got kinked or the air vent tube got kinked. The other thing could be that one of the two could also be blocked by something. Try putting some air through the fill tube side or heck just blow out the whole system like you are winterizing that may just fix things.
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Old 10-05-2012, 05:24 PM   #3
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Your vent tube is blocked.
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Old 10-05-2012, 08:31 PM   #4
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Quote:
Originally Posted by rollondown
Your vent tube is blocked.
Ditto.
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Old 10-06-2012, 09:50 AM   #5
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Thanks

Thanks folks! I'll fire up the air compressor and give it a blast!
Tom
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Old 10-06-2012, 06:41 PM   #6
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Curious, what would block the vent tube? I'd hate to think of anything but fresh water in my system.
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Old 10-06-2012, 09:15 PM   #7
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Mud daubers, bugs, etc. Do you have a screen over your vent? Some vent under the trailer, some vent by the fill opening.
I wouldn't just blow air into it. I'd find the hoses and check for kinks or any vapor locks that might be in the system.
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Old 10-06-2012, 09:27 PM   #8
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A low spot in the vent line can make you crazy! It fills with water from the tank sloshing around or being over filled - effectively blocking it. Should be level or down hill all the way from one end to the other...
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Old 10-07-2012, 03:48 AM   #9
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Quote:
Should be level or down hill all the way from one end to the other...
My preference is to have it gently rising with no dips with the open end at least a few inches above the top of the tank. This stops airlocks that prevent filling and also stops syphoning of water after filling.

One way you can fill the tank entirely (as a test) is to use a hose small enough in diameter and without a end fitting s that you can slip the hose right down the fill tube until it is inside the tank. Hose should be small enough so that air can vent up the fill tube.
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