I wouldn't have believed this except I just spent the last 2 days fixing the tractor, it seems some old steel military surplus gas cans, [ the 5 gall jerry can] have a tan colored liner applied inside them, after many years this liner starts flaking off, I had been having junk in the gas tank of one of the tractors and kept pulling little pieces of what appeared to be flakes of paint out of the tank, [ 2 foot long tweezers named reptile feeders are great for this] anyway my son who happened to be home on leave from the navy mentioned I should check that particular gas can, it was this jerry can liner coming apart , if you all have these around take a good flashlight and look inside the can and check yours, if it has one, and its flaking it will be obvious , spending a couple days cleaning the entire fuel system on a tractor really wasn't what I wanted to do