I was helping a buddy at work once - his refrigerator would not run properly on gas. It as a tiny 4 cubic foot one on a A-Liner type trailer. So the flame looked really small, but who knows? It was about 1/2 the capacity as mine in my Bounder motorhome. SO I took apart the gas lines, found some white stuff inside the gas tube that basically fell apart. I was worried, how would I get that back into the tube, and I never saw anything like that in a catalog before. So I put it back together and it lit fine, had a healthy flame, and ran good!
It was only later that I finally guessed that the white stuff inside the gas line probably was a spider web, and eggs. Spiders typically like to nest near a methane pit (Pile of doggy doo) and the propane line is a fine substitute in many cases. This only blocked about 40% of the gas flow, and it still lit up. Just did not perform right.
Anyway he got it fixed for free, only cost him a lunch the following week.
Fred.