I was brush hogging today with my 650 and it started to sputter as if it were running out of fuel. I let it die and went a poured 5 gallons of fresh diesel in. After I refueled I tried restarting it and it just would not start. It coughed a couple of times but after lots of cranking, no luck. So far all I had time to try was to check the fuel on the on the outbound (towards injector?) side of the fuel filter and checked the fuel filter itself. Both were not clogged and had fuel flowing freely. Any suggestions of what to check next? I just bought it recently and this was it's very first tank of fuel (of my ownership) that it has gone through and it has never given me any starting problems, always starts up right away. I disengaged the pto's, and ran through everything in the owner's manual for a no start so I don't think it's any of the dumb stuff. Thanks!