I had teh pump rebuilt by a local shop that has lots of Deere experience. Now when I start it, it stars hard, lots of cranking and when it does catch it acts like its running on only a couple cylinders. It runs and "clears up " somewhat, but still runs rough. When I plug in teh block...
I have a similar problem. 2004 5420. Has been surging at startup for a minute or so. Harder than usual starting. I have an external fuel pump and an inline strainer filter in the fuel tank line to the filter. Been flawless even in the winter. Ran it today for an hour, started a bit...