When ours flamed out like that and refused to burn after that, I ended up taking it out and servicing it on the bench. It ended up being rust that clogged up the Jet. I cleaned the jet and blew all the rust chips/dust out of the lines all the way back to the propane tanks. Works like a champ.
It could be many things though.
1999 Ford Superduty F250 PSD CC SB 6spd 4x4.
B&W goosneck/companion hitch, Airlift 5000 airbags.
2006 Sierra F28 Rear Kitchen 5th Wheel, 31' = 10k pounds.
Nights camped in 09-14, 2010-23