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Old 07-10-2016, 12:02 PM   #1
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Gray/Black Tank Gauges way Off

Finally after continually complaining about our Galley/Gray/Black tanks filling up way too quickly for the umpteenth time, I decided it was time to confirm my suspicions about tank levels being way off. Simply amazing how far off the gauges are at 1/3 and 2/3. Who would have thought it?
Galley Gray Black Fresh
Empty 0 gal 0 gal 0 gal 0 gal
1/3 1 gal 2 gal 2 gal 3 gal
2/3 8 gal 8 gal 13 gal 14 gal
Full 24 gal 24 gal 30 gal 25 gal
Capacity 30 30 30 38

This is ridiculous. My 8 year old grandson could come closer to knowing where to put a sensor for 1/3 and 2/3. When will the RV industry start building quality into their products??
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Old 07-10-2016, 12:27 PM   #2
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Not so much as where the sensor is but if it gets tt paper hung up and a lot of crud from gray water that they get covered which cause erroneous readings. Maybe some day they come up with a better idea but then cost more to do. Later RJD
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Old 07-10-2016, 12:29 PM   #3
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On at least some of the tanks, the issue could be that there is some liquid in the tank after the drain stops draining. You are assuming that when the tank stops draining, there is "0 gal" in the tank. For the FW tank this is many times not the case. Ie. If there is 8 gals in the FW tank when the drain stops, then the readings are very close to correct.
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Old 07-10-2016, 12:29 PM   #4
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Some day you'll not even look at those worthless gauges and just "know" when it's time to dump.



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Old 07-10-2016, 12:30 PM   #5
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I wish they would stop putting gauges on the tanks ...... The few years that they have been used on the tanks they have been problematic. I know how long ours takes to fill so I don't use the gauges. The tanks are usually smaller on one end and deeper on the other to drain so its is not an easy task to get them right.



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Old 07-10-2016, 01:38 PM   #6
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Get this


https://youtu.be/-kttyNVuVEI
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Old 07-10-2016, 02:02 PM   #7
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Thanks for the replies. I tipped the camper every which way to make sure they were empty, then when I filled them, I was able to add as much water as the tank capacities were. So, fairly sure there was no residual liquid in the tanks. Just amazing that for 1/3 full, it only took a couple of gallons in a tank, even the fresh water tank. I'm posting a small chart by my indicator lights for reference. Normally we would never get to the max, but heading out for 30 days in September so, will be dumping along the way.

Tom
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Old 07-11-2016, 12:13 PM   #8
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The issue is that they measure 1/3rd as distance, not volume. 1/3rd the way up a sloped bottom tank isn't very many gallons. Especially when the sensors are on the tall end.
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Old 07-11-2016, 12:46 PM   #9
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Quote:
Originally Posted by aceinspp View Post
Not so much as where the sensor is but if it gets tt paper hung up and a lot of crud from gray water that they get covered which cause erroneous readings. Maybe some day they come up with a better idea but then cost more to do. Later RJD
Once a year Usually befor a longer trip, I fill my black tank with ice and a scoop of powdered laundry soap. As the ice melts it sloshes around in the tank and cleans the sensors. It does not make them correct but it dous clean the tank and sensors good.
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Old 07-11-2016, 12:51 PM   #10
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OMG! How much ice does it take to fill your black tank?
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