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Old 01-15-2015, 10:01 AM   #15
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jdalrymple's Avatar
2009 27' FB Flying Cloud
1991 35' Airstream 350
Jay , Oklahoma
Join Date: Oct 2006
Posts: 1,635
The theory is sound. As mentioned above, several rigs came this way. Our '91 350LE MH is so equipped.

The only problem I see is perhaps in the SeeLevel system.

I expect the signal from the 3/4 or full sensor on the tank is not a simple 12 volts.

It is probably some very low level voltage, more like microvolts, or to be more technical "logic" level signal.

The rub will be converting this logic signal to something useful and able to switch your valve on and off.

Transistors, resistors, and diodes kind of stuff.

Even if the sensors were a full 12 volt simple on/off signal, one would need a relay to turn off the valve after the manual turn on is switch activated.

A sperate level sensor for pump turn off, not part of the SeeLevel system might be easier to deal with.

Certainly not impossible, but a some knowledge and a trip to a well stocked Radioshack store would be required.



Jeff & Cindy
'09 27FB Flying Cloud
'91 350 LE MH
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Old 01-15-2015, 10:18 AM   #16
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2005 39' Land Yacht 390 XL 396
Common Sense , Texas
Join Date: Sep 2007
Posts: 5,315

Here's how I would do it, but only if I wanted it really bad.

Put two "T"s in the water line one coming from the tank to the pump, and one on the output of the pump. The pump acts as a check valve between the system and the tank, so install the valve in parallel with the the on position, water will flow around the pump and into the tank, and in the off position, it will not.

Then install a switch to send power to the pump thru a self energizing relay, single pole, double throw. Then on the ground side of the pump, route the ground thru the relay, normally closed side, with the center pole of the relay to an additional sensor you install in the top of the tank. When the water touches this sensor, it will then be ground, and have that signal interrupt the self energizing part of the relay, turning off the valve.

Now, the way I would really do it if I wanted such a system....I would install a manual valve in the same way, parallel with the pump, but route the lines so that I could mount the valve in a convenient to access location. To turn on the flow the tank, open the valve till water runs out the filler door, then close the valve.

Good luck.

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Old 01-15-2015, 10:57 AM   #17
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1979 31' Excella 500
Charlevoix , Michigan
Join Date: Aug 2014
Posts: 335
Thank you everyone for your input; there are some great solutions here!

I've decided to go the manual route instead of trying to turn off the valve automatically when the tank is full. Since I'm not an Electrical Engineer I'd be in a tough spot if the fully automatic solution broke down while I was one the road. Keep it simple (stupid) right?

Thanks again everyone for pointing me in the right direction!

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