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Old 03-28-2017, 08:44 PM   #1
Junior Member
National RV Owners Club
Join Date: Mar 2017
Posts: 2
Grey water tank mystery

Have a 33' tropical and are camping with only electricity. Yesterday our grey water tank showed full after about four days use, showers, dish washing. We drained the tanks and topped off fresh water. Grey tank gage showed one light. Today, 36 hours later, grey gage is showing red after only four conservative dish washings and no showers. How can that be? We also would hear a gurgle or burp sound from the vent. FW tank still full. Pump only runs when using water. Is there a way to inspect the tank interior?

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Old 03-29-2017, 11:39 AM   #2
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Gulf Streamers Club
Join Date: Jan 2012
Location: Cincinnati
Posts: 19,925

The grey tank is usually black plastic, so you can't see the liquid level through the sides. If you hook up your stinky slinky and pull the lever on the grey tank that would be the only inspection. If you can touch the tanks, rapping on the side at different levels can indicate level of liquid. Try it a few times under full and empty condition until you get an 'ear' for the different sounds. Knuckles or screwdriver handle is all that's needed, don't use an ice pick or nail hammer!

Tank level sensors are notoriously inaccurate, grey tanks can suffer from grease and soap scum build up on the tank sides. You already put soapy water in it, you could add a bunch of Dawn detergent to try to cut the scum and grease and let it soak, then drive a crooked road to slosh it around.

Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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tank, water

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