I'm sure you know this but new fuel filters and new fuel would be a good start. Return line would also be good because they probably leak or soon will if they haven't been replaced recently. A valve adjustment won't hurt either.

I bet the Diesel has algae in it though since it died and it sat for so long..... gotta kill that stuff.

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1985 300D Turbo ~225k
2000 F350 (Powerstroke) 4X4, SWB, CC, SRW, 6spd ~148k
1999 International 4900, DT466e (250hp/660 ft/lbs), Allison MD3060 ~73k