What ?

Gave a possible idea on what the cotton like substance was that blocked the elbow in gbenkfarm's posting. Which is why I quoted his post.

Have seen stranger things. Grandad had a fuel starving issue on a gas tractor always under 1/2 tank but intermittent. Turned out a dead spider that had been in the nozzle would get sucked down over the tank outlet and starve it till it died. As soon as the suction released it would start and run again.