Yeah , these other things can happen,but the orifice purge is the only
solution  I have needed on several friges.Fires right up afterwords.The
hole is soooo fine that residue from just about anything will narrow it too
much.Corrosion from just sitting will do the deed too.All burners have dead
bugs in them,but I just fry them up.While you have the frig out, you can
tell how the valve is,by  turning on the gas.While you got the frige out ,
burp it.Turn it upside down and shake it vigorously for a couple
minutes.Some people keep it upsde down for a couple days and tap the pipes
with a rubber hamnmer a few times.This will allow the liquid inside the
pipes to come out from the nooks and crannys and go back where it
belongs.You can hook up the frig to a common gas grill tank/valve and fire
it up.No electricity needed.You can play with it till you turn blue in the
face, but the soultion has always been the orifice.If it fires up with the
gas grill propane , but not in the van, may be the valve.Almost all valves
are 11 inches of water collum(hello mike)unless they are for special
applicaton. I learned this trick after r and r-ing the frige about 10 times.