Yesterday I went to start my vintage JD 820 the real deal not euro trash, or more politely BIG twin Diesel to plow the 18'' dump over the last day and a half. the tractor had a small gas pony motor that spins the diesel. pony wouldn't fire, I drained the fuel out of the carb, and then tryed to flush it until I got clean fuel, barely a trickle. I pulled the fuel system (Gas) apart heading towards the tiny starting tank. barely any thing came out of the sediment bowl outlet. I decided it would be easier to take the sediment bowl off to clean it rather than do it in situ. There was a bit of crap on the bowl, but the screen and upper party of the bowl were covered in greenish grey goop. I cleaned it up only to discover that the screen had separated at the outside. maybe the screen was old damage, don't know, had only just dumped the bowl previously. Went to the local hardware store to get a replacement, bowl assembly, they had sold the one that was in stock, and the supplier didn't have a replacement, so I changed to a valve and inline filter. In the past, the shutoff valve would slowly drip the tiny bit of fuel out of the tank, so I probably got away with the gas not clogging things, finally got it back together and running, but in the future, I will drain the system dry. I probably didn't start the tractor last winter, so maybe it sat longer than I think, won't be leaving it that long anymore.