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Old 09-03-2022, 06:10 PM   #1
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fresh water tank

our class c has a 44 gal fresh water tank. filled it before we left cg, at least the sensor said it was full. 5 hr drive to get home, very little water was used, just toilet. I fill water tank to load up rear springs for a better ride. arrived at home sensor showed tank was 1/3 full. no visible leaks anywhere including normal walk around .inspection at rest stops. stumped
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Old 09-03-2022, 06:38 PM   #2
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That’s a big leak. Hopefully it’s easy to find.
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Old 09-03-2022, 07:10 PM   #3
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Low point drain open slightly. Vent tube off fresh water tank.
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Old 09-03-2022, 07:11 PM   #4
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You have 3 duplicate postings

Water is siphoning out overflow while driving
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Old 09-03-2022, 07:37 PM   #5
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^^^^^
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Old 09-03-2022, 07:46 PM   #6
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That's my thought if it was full started to syphon.
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Old 09-03-2022, 10:11 PM   #7
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Did you notice if your grey or black tank levels increased? We once travelled with the water pump on, and the shower leaked water while we were traveling thus increasing the grey tank level. We now always make sure the pump is off when underway.
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Old 09-04-2022, 04:35 AM   #8
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thanks, where is vent tube located, have not located on top of tank. tank is almost flush with chassis so difficult to see.
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Old 09-04-2022, 08:54 AM   #9
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As Capacitor stated, your low-point drains might be leaking.

I would fill the tank at home, park on a dry surface, then come out a few hours later and check everything.

It is possible your fresh water tank is holding the water, but your tank sensors are faulty along with using more water than realized during your trip home.

About the vent siphoning. I wonder how that can happen without a tube going deep inside the tank. If that is the case, you will want to adjust the tube inside so it is close to the top of the tank.
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Old 09-04-2022, 08:55 AM   #10
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just went under chassis to fresh water tank again. fill and low point drain connections to tank are tight. there are 3 white hoses that appear to be coming from top of tank but there inn't much space between tank and chassis so cannot physical see or touch them.the 2 white hoses appear to be ok. not sure why there are 3. all 3 are about 12"'s long along the side of the tank
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Old 09-04-2022, 09:01 AM   #11
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Probably a fill and vent on top and on the bottom one to the pump.
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Old 09-04-2022, 09:56 AM   #12
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Tanks often have a vent on the front and rear ends of the tank. That’s so the tank will vent as it’s being filled if it isn’t completely level. Using my coach as an example….. I can fill my 100 gallon holding tank full. My driveway is downhill going to the road. When I stop at the end of my driveway, the water is pushing forward and will run into and out of, the overflow/vent. It starts a siphon effect, and won’t stop until it has sucked out about 20 gallons. The same thing can happen just stopping for a stop sign. It’s extremely common, and is quite possibly your problem.
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Old 09-04-2022, 10:10 AM   #13
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both gray and black tanks empty.
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Old 09-04-2022, 11:43 PM   #14
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So how full were waste tanks?
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