Picked up a 531 at an auction this past weekend. It will make a nice addition to my hay crew. One problem though, It was a little hard to start at the Auction Sat, and again when I went to pick it up yesterday, though once it started, it seemed to run well. Put it on the trailer and towed it home, mostly on back roads. When I went to unload it, it would not start. Cracked the coupling on the fuel line and fuel came out. Didn't have time to pull the little screen out at the injector, that is next. What else should I look for? It seems if it was compression, it wouldn't have started earlier, though the hour meter is 4700. My first suspicion is the bumpy back roads loosened trash in the fuel system. Any suggestions?