I knew there is an unserviceable seal in the tank shutoff stem above tank shut off seat as some times you can fail a LP pressure drop test as it can leak out the top of the valve and you have the valve closed.
But it did not dawn on me that it too can leak while being turned on given the right situation. I had a wiff of LP stink when I turned on my tanks last year. And I leak solutioned the green nut several times and found nothing. Then I remembered your post from a long time ago where you mentioned the full open trick. So I tried it and so far there is no more wiff when I open up the tank cover to shut the gas off. So I now practice the fully open valve too but did not before.
In the old days before the age of the new ACME plastic gas connection nuts at the tanks with a flow restrictor in them, it was common to see it recommended to not open the tank all the way as part of a safety feature as there is no way you can use all that volume. Now the green nut I think is rated to pass ~ 70,000 BTU's and that is plenty to run the camper. The black ones that are on BBQ grills etc pass about 1/2 of the green nut. That was part of going to the new standard was to limit how much LP could flow in the event you had an issue down stream. I have not recently in light of the new flow restrictor nuts remember seeing the partail open the valve comment any more.
Thanks for passing this along.
Current Sunlines: 2004 T310SR, 2004 T1950, 2004 T2475, 2007 T2499, 2004 T317SR
Prior Sunlines: 2004 T2499 - Fern Blue
2005 Ford F350 Lariat, 6.8L V10 W/ 4.10 rear axle, CC, Short Bed, SRW. Reese HP trunnion bar hitch W/ HP DC
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