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Thread: LP Tank Sensor
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Old 05-30-2024, 10:10 AM   #7
Bob Nodine
Senior Member
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Brand: Thor Motor Coach
Model: Quantum JM31
State: Tennessee
Posts: 796
THOR #21926
Originally Posted by PreCambrian View Post
I assume that you completely emptied your tank and then filled the tank to determine this. I think that I have the same problem. I guess that I will leave the refrigerator or heater on in the driveway to empty the tank so I can find out for certain if it is the gauge or the OPD that is off.
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.
Attached Files
File Type: pdf The innards of a propane tank.pdf (544.1 KB, 22 views)
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