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Thread: LP Tank Sensor
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Old 05-30-2024, 12:39 PM   #8
Senior Member
Brand: Thor Motor Coach
Model: Four Winds 22E
State: California
Posts: 145
THOR #27561
Originally Posted by Bob Nodine View Post
We ordered this motorhome and when we went to pick it up the dealer had not filled the propane tank. We complained and a tech took the motorhome back to their propane filling location and then brought it back. We noticed it did not show full but wanted to be on our way so just said thanks and headed out.

It seemed like the tank was low in no time at all so we went to a filling location and watched while a tech filled the tank. He could not get any flow out of the bleed valve before the OPD valve shut off the input. He could only get a few gallons into the tank. This put me on alert so the next time we had the tank filled I ask the tech to make sure he got some propane coming out of the bleed valve. He could not. That was when I realized the OPD valve was shutting off before 80 %. I did some research on propane tanks to confirm this. I even found a cutaway view of the insides of our propane tank. If you look at the cutaway you can see the overflow tube and the OPD valve.

We emptied our tank and had it filled again and could only get 8.2 gallons in a 12 gallon tank. Math says I should be able to get 9.6 gallons in the tank but never can.

I did a search in our area for a place to get the propane tank serviced but every time I would contact one of these places they declined to work on the tank. So I ordered a new OPD valve, emptied the tank, and removed it from the motorhome. I was never able to break loose the old OPD valve because of thread locking glue. I even used a pipe for leverage. Ended up putting the tank back in the motorhome and we just live with it. I still have a new OPD valve.
Thanks for the detailed explanation. I probably have the same size tank as yours (12.2 gallons, 9.76 gallons water capacity). I have never put in more than 6 gallons even when filling it with the tank gauge reading less than 1/8. I will try using my infrared camera when I get home to check if itís the gauge or the OPD. Final check will be emptying the tank and refilling it. I havenít emptied the tank on a trip because I know that my wife wonít appreciate spoiled food and cold water just for the purpose of an engineering investigation.

The propane cutaway article was very interesting.
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