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My RV's Holding Tank Gauges are Inaccurate

by Anonymous

Why does it seem everytime I empty the holding tanks at a dumping ststion the monitors always read liquid is still present?

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ANSWER: Hi thanks for submitting your question on our Ask An RV Question Page

This is one of the most common complaints among all RVer regardless of what type of RV they have. The fact is that holding tank gauges in RVs are notorious for being inaccurate.

The most common cause for the gauges not showing the proper level in your holding tanks is due to the probes used to measure the waste level in the holding tank being dirty, which causes them not to work. The first thing you can try is some RV Probe Cleaner and see if that gets the probes working again. Do not use probe cleaner in your fresh water tank.

Some RVers have had good luck by dumping some original Dawn Liquid Dish Detergent in their Black and Grey Water Holding Tanks. The Dawn seems to break up all of gunk on the probes. Again, do not use the Dawn in your Fresh Water Holding Tank.

Sometimes dumping a couple bags of ice cubes into the holding tank and driving the RV around will help clean the probes.

If the problem readings are coming from your Black Water Holding Tank you can get a flexible tank wand or a Master Blaster Tank Wand and use them through the toilet to help clean out the tank and the probes.

If none of the suggestions above work, there could be other problems causing the gauges not to work, such as a bad sending unit, a bad gauge, etc. In those cases you would have to have a Certified RV Technician diagnose and repair the problem.

Some RVers just throw up their hands in frustration and just give up on the tank gauges ever giving accurate readings and have become pretty good at just knowing when to dump the tanks.

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Hope this helps.

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Happy RVing

RVing Al

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