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Old 08-01-2011, 03:11 PM   #1
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Tank Level Indicator Question.

I have a 2007 jayflight 31bhs and when I empty by black or gray water my tank indicator still shows 3/4 or more. I dried out my black water tank and it now shows empty. My fresh water tank reads accurately. My gray water tank is empty and the drain has been open for 24 hours (so I know it is empty) and it still shows 3/4. When I hold the button down for a minute the 3/4 light goes out indicating 1/2 full.

Is this the norm or do I have a problem?

Thanks in advance for any help.
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Old 08-01-2011, 03:16 PM   #2
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This is the norm, I`m afraid. I have little faith in the indicators. Even my fresh tank when full to the brim reads 2/3. You can clean your tanks and may see some temporary improvement but no long term fix.................
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Old 08-01-2011, 08:36 PM   #3
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Chances are that the only tlime those gauges were correct was in 2007 when it left the dealers lot. You can somewhat rely on the frest water gauge and the battery gauge but not the others.
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Old 08-01-2011, 08:55 PM   #4
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Would that these gauges were optional. Then we could all save a couple $$.
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Old 08-01-2011, 10:30 PM   #5
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Quote:
Originally Posted by Gunny Bro View Post
I have a 2007 jayflight 31bhs and when I empty by black or gray water my tank indicator still shows 3/4 or more. I dried out my black water tank and it now shows empty. My fresh water tank reads accurately. My gray water tank is empty and the drain has been open for 24 hours (so I know it is empty) and it still shows 3/4. When I hold the button down for a minute the 3/4 light goes out indicating 1/2 full.

Is this the norm or do I have a problem?

Thanks in advance for any help.
Common problem with a lot of RVs. Most black tank and grey tank gauges are notoriesly innaccuate. Several solutions have been tried but few have worked.
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Old 08-02-2011, 07:18 AM   #6
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If you're willing to make a small investment ($$$), this company manufactures products that will accurately measure the level of water (or whatever) in your holding tanks. I have RV friends that have their equipment installed so I know it works.

SeeLevel RV Gauges
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Old 08-02-2011, 09:49 AM   #7
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What you end up doing is "learning" your tanks. What I do is start with the gauges, but like you said they are pretty inaccurate. Next - I took a flashlight to the toilet and looked down the hole. I watched it fill all the way up until it starts to reach the level of the floor. I was amazed at just how much I could get in there. I can pretty quickly gauge my tank level by just looking down the hole now. The gray was a little more tricky, but I find the gauge works most of the time after it has sat for a while and any splash has come off the sensors. If you have an open underbelly, you can also look under there and see how much the tank is bulging. It is actually pretty interesting how much the tank expands as it fills and can give you a good indication of how full it is.
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Old 08-02-2011, 10:36 AM   #8
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Each time I add chemicals to the black holding tank, I add 1/2 to 1 cup of liquid laundry detergent( cheap stuff) with a bucket of water, then as we drive down the road the tanks gets washed, when you dump the tank, the "stuff" smells better and the soap makes it slicker so far my tank gauges work. Same trick on the gray tanks,
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Old 08-02-2011, 01:37 PM   #9
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Quote:
Originally Posted by FPM III View Post
If you're willing to make a small investment ($$$), this company manufactures products that will accurately measure the level of water (or whatever) in your holding tanks. I have RV friends that have their equipment installed so I know it works.

SeeLevel RV Gauges
FPM III,
Thanks for the link. Looks like a nice system.
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Old 08-03-2011, 08:01 PM   #10
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Thanks for all the input. I have the tanks open and empty now for three days and they are reading 1/3. Looks like any moisture inside will give them reading errors.
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