I had this same problem last year while we were dry camping in colorado. I was about 30 miles from the nearest town and wasn't about to break camp and haul it in. I was able to remove the top and adjust the gas flow to the pilot, it was just a small screw if I remember correctly. Worked like a champ after that.
2007 GMC 2500HD CC LBZ DIESEL 3.73
2008 GMC Yukon XL Denali 6.2
2007 Jay Flight 29 BHS