Stuck black water gage, or really full?
I'm perplexed! I either have a gage stuck on 3/4 full or I've got build up that won't drain. We don't leave the gate valve open for draining while camping as I know that's a big no-no. We only open ...
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Chances are it's empty, The gages are really sensors and get gunked up and give false reading. Some people worry about it and some people don't Myself I never even look at the gage.
