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Old 08-21-2019, 03:19 AM   #1
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Question Help! Air lock in fresh water fill pipe or tank?

We are having a pesky problem filling our fresh water tank over the past few months. When we begin filling it as usual with a hose, the water very quickly begins to run nearly full stream back out the opening, and proceeds to do that until there is something like a "burp", and some air comes out, and then more water will go in for a while, then another burp, and so on. The result is that it takes 3-4 times as long as it should to fill the tank, and meanwhile the people in line behind us are tapping their feet and wondering what is wrong with us. We are not newbies, but not good mechanically, and don't know where to start to address this problem. It seems to have just started this season, so maybe could have something to do with how the valves were turned or not turned during winterization? Not sure how so much air can get into the tank. Any advice will be appreciated, both by us, and those poor people behind us.



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Old 08-21-2019, 04:22 AM   #2
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Sounds like the air vent tube for the fresh tank is clogged or non-existent.
If it is like our 2014 Sprinter-based GWV (the FIRST out of the Alabama plant), there should be a 1/4" clear plastic tube that runs from the top of the fresh tank to the little round screen thing next to the water fill port. Its purpose is to let air in and out of the tank as the water level changes. Sounds like yours needs attention.
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Old 08-21-2019, 08:26 AM   #3
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Default Hydraulic u-tube in vent

I had a very similar issue on my Bigfoot trailer with very similar gurgling symptoms. As mentioned by Pete check your tank vent tube, it should connect top of the water tank with the filler port. If this tube sags it will form a hydraulic u-tube and in case of overfill this u-tube will fill water and block venting with a few inches of water back pressure. Best solution is to lift the middle of the tubing to eliminate u-tube formation. On my trailer a cable zip tie eliminated the u-tube killed the issue.
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Old 08-21-2019, 10:44 AM   #4
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Quote:
Originally Posted by avanti View Post
Sounds like the air vent tube for the fresh tank is clogged or non-existent.
If it is like our 2014 Sprinter-based GWV (the FIRST out of the Alabama plant),
Which Alabama plant?
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Old 08-21-2019, 01:19 PM   #5
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Which Alabama plant?
Long, sad story. In early 2014, GWV was lured from Winnipeg to rural Winfield AL. They were given attractive incentives and set up in a nice, new plant. Worked out poorly for all involved and they were soon out of business.
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Old 08-22-2019, 12:21 AM   #6
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Quote:
Originally Posted by avanti View Post
Sounds like the air vent tube for the fresh tank is clogged or non-existent.
If it is like our 2014 Sprinter-based GWV (the FIRST out of the Alabama plant), there should be a 1/4" clear plastic tube that runs from the top of the fresh tank to the little round screen thing next to the water fill port. Its purpose is to let air in and out of the tank as the water level changes. Sounds like yours needs attention.
Thank you, Avanti. Will look for this.

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Old 08-22-2019, 12:25 AM   #7
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Thanks! This is helpful! Now if one of us can just manage to get under this low-low van. . , will let you know what happens.
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Old 08-22-2019, 12:49 AM   #8
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Thanks! This is helpful! Now if one of us can just manage to get under this low-low van. . , will let you know what happens.
Build a set of these:

Lift f.jpg

Lift.jpg

You will be glad you did.
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Old 08-29-2019, 09:52 PM   #9
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Open a cold water tap to let the air out. Same when filling hot water tank.
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Old 08-29-2019, 11:51 PM   #10
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go online and search for a ""Water Heater Tank Rinser", put it on the end of your fill hose and the air in the tank will come out without burping all over you. works like a charm.
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