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Old 09-16-2020, 04:25 PM   #61
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Itís not a sensor problem but I did recently add the Sea Level Systems tank monitors because I want more accurate readings of the tank level.
That's the one I saw
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Old 09-16-2020, 04:36 PM   #62
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Itís not a sensor problem, the tank just doesnít empty all the way. I drain it, it still reads 1/3 full and the bottom of the tank is bulging down from the retained liquid. If I raise the nose of the camper all the way and press up on the tank I get 20 plus gallons out after previously draining it.
Agreed. Not only do the sensors have to work, but it's necessary the tank does what it's suppose to, and drain completely. I'm curious why there's tanks sagging now. Perhaps Jayco's using a different brand of tank in production?

Ours were made by a company called AmeriKart. per the label stuck to them.
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Old 09-16-2020, 06:48 PM   #63
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That's the one I saw
I put a 40 gallon water tank into a utility trailer back in 2010 and put that sensor system on the tank and it has been great. Last weekend I put them on all four tanks in my camper. No more 1/3, 2/3, now it is 5%, 6%, etc.
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Old 09-16-2020, 06:50 PM   #64
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Agreed. Not only do the sensors have to work, but it's necessary the tank does what it's suppose to, and drain completely. I'm curious why there's tanks sagging now. Perhaps Jayco's using a different brand of tank in production?

Ours were made by a company called AmeriKart. per the label stuck to them.
Have you checked the two tanks under the basement when they are full, my understanding is sagging is pretty standard in fifth wheels.

When you drain your black tank does it read empty or always read 1/3 full because that is also common in fifth wheels because of the sagging.
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Old 09-16-2020, 07:09 PM   #65
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Hereís a suggestion. If you plan on using plywood to support the tank, why not add some shims or extra supports at the rear of the tank so that itís sloped to the drain? Second suggestion would be to use some exterior grade or marine plywood and not just regular plywood or OSB.
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Old 09-16-2020, 07:53 PM   #66
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Hereís a suggestion. If you plan on using plywood to support the tank, why not add some shims or extra supports at the rear of the tank so that itís sloped to the drain? Second suggestion would be to use some exterior grade or marine plywood and not just regular plywood or OSB.
It is already somewhat sloped and there is very little space to work with. I am putting in 3/8" exterior grade plywood and that will be tight. In fact I am a little worried even with that. The tank is supported around the top edge and then underneath and I think adding the plywood will lift the tank off the top supports and transfer all the weight to the bottom cross bars.

What I plan to do it glue and screw oak strips to the underside of the plywood in between the steel cross bars to stiffen it. I will post some pictures once it is done, hopefully this weekend.
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Old 09-17-2020, 05:30 AM   #67
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Have you checked the two tanks under the basement when they are full, my understanding is sagging is pretty standard in fifth wheels.

When you drain your black tank does it read empty or always read 1/3 full because that is also common in fifth wheels because of the sagging.
What if you raise the brackets 3/8 on the ends so the plywood would fit. This would lower the square tubing 3/8
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Old 09-17-2020, 08:48 AM   #68
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What if you raise the brackets 3/8 on the ends so the plywood would fit. This would lower the square tubing 3/8
What brackets?

There are 2 - 12" I beams that run the length of the camper and the 2 cross braces are bolted directly to the bottom of the I beams. One of the cross braces is square tubing and one is kind of a C channel.

I might put spacers between the cross pieces and the I beams, maybe something like 1/4" spacers. I need to make sure the Coroplast still fits. The tanks are constrained in every direction so I am kind of trying to thread a needle.
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Old 09-18-2020, 05:34 PM   #69
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The two cross braces that are screwed to the 12" beam raise the part that screws into the 12" beams by welding or like you said put a 3/8 block in between that would give you room for your plywood
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Old 09-18-2020, 06:59 PM   #70
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I built the black tank support today and part of the gray tank support. I plan to finish and install them tomorrow, pictures to come.

Another Jayco workmanship issue I found today is there is a partial saw cut into the black tank near the very front. I will reenforce that before I close it up.
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Old 09-20-2020, 10:25 PM   #71
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The tanks supports are built and installed and the tanks no longer bulge and drain completely with the trailer level.

Here is the original situation, this shows the two cross bars under the tanks. The tanks are empty in this picture, normally the tanks bulge between the front and the first bar, the first and second bar and the second bar and end.



Here is the support I built, it is 3/8" exterior grade plywood with oak 1x2 support, the oak is screwed to the plywood with lots of counter sunk screws and glued as well. The left side in the picture will get screwed to the frame in front with tek screws (that will be the high point), the two channels are where the cross supports will go and the right end has 1x2 sticking off the end for support straps. The 3/8" plywood goes over the support beams and I was concerned about pushing up the tank too much because there is a lip on top that currently carries a lot of the weight. I put 1/4" spacers between the I beams and cross members so the plywood only presses up 1/8". I had to be careful I didn't lower the cross beams too much and create problems with getting the bottom cover back on.



Here is the tank support in place looking towards the front of the camper.



Here is the back of the support installed showing the support straps.



The tanks now slopes smoothly down from front to back with a flat bottom (no bulging at all), more importantly between the tank support and re-plumbing the outlets the tanks now drains completely with the camper level.
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Old 09-20-2020, 10:48 PM   #72
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Have you checked the two tanks under the basement when they are full, my understanding is sagging is pretty standard in fifth wheels.

When you drain your black tank does it read empty or always read 1/3 full because that is also common in fifth wheels because of the sagging.
I have looked at them when they were almost full, after reading some of the posts here, and being the curious type. Not much, if any bulging. We have a small-ish TT with 32 gallon tanks, but they are held up by the tank flange with aluminum plates screwed to the floor. There are no cross braces on either one. The black has always read empty, and the gray needed the sensors replaced. It started to read 1/3 after dumping, so I replaced the sensors with the Horst brand.

Perhaps our tanks are small enough so they don't bulge at the bottom.
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Old 09-20-2020, 10:58 PM   #73
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In case anyone ever needs to re-plumb their tanks.

The drain lines are 3" Drain Waste Vent (DWV) ABS, DWV is designed for drain lines that aren't under pressure. The pipe and fittings are glued together, I originally assumed they were PVC but they aren't and you can't glue PVC and ABS together. Lowes actually sells the pipe and fittings but has limited availability in stores, you can order it on-line from them.

The 3" lines attach to the tanks with hose clamps and lots of white sticky caulking. I tried to find out what Jayco used but ran out of time. My dealer said to use Butyl tape and I did and I have no leaks but Jayco later got back to me and said they use Quad sealant.

I believe the tanks themselves are Polyethylene, I know the ICAN H3554 50 gallon Jayco replacement tank is Polyethylene.
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Old 09-20-2020, 11:07 PM   #74
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I have looked at them when they were almost full, after reading some of the posts here, and being the curious type. Not much, if any bulging. We have a small-ish TT with 32 gallon tanks, but they are held up by the tank flange with aluminum plates screwed to the floor. There are no cross braces on either one. The black has always read empty, and the gray needed the sensors replaced. It started to read 1/3 after dumping, so I replaced the sensors with the Horst brand.

Perhaps our tanks are small enough so they don't bulge at the bottom.
I have the two 50 gallons under the basement and they both bulge although the black bulges more than the gray. I think the black bulges more because the black sits full more often, for example on hook ups the black valve is closed and gray valves are open.

I also have a 35 gallon tank for the galley and have no problem with that tank so I think you are right that the smaller size is the difference. I also think travel trailer tanks may not be as shallow as the tanks under the fifth wheel basement.

I read over the weekend that Luxe puts 5/8" plywood under all their holding tanks. I would bet every fifth wheel owner without plywood under the 50 gallon tanks under the basement has at least some bowing and some retention of liquids. I know other Jayco owners who after the first trip never saw the 1/3 full light go out on their black tank ever again. There is also another post earlier in this thread about how Montana mentions the need to elevate the front of their rigs to empty the tanks in a factory walk through video so I think this is a common problem with the big tanks.
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