Tanks to red!
Injection pump had lost its prime and there seems to be a blockage of some sort in the tank pickup line (unless in the replaced lines from the fuel filter to the tank, air is still getting in - yes, orings replaced on the tank selector). It pulls fuel from the filter just fine.
Glad you got it running. Had almost the same issue on my 818.
Had 0 of 4 batteries, only one tray, so I could only put 2 in, for now.
Took the 2 batteries from my 1009 to try to start it and it would crank and crank but no start.
I had a restriction in one of the tanks, I am running on the left tank since the right one had no cap for who knows how long, so I know there is water in there.
Anyway, took the fuel hose off at the filter inlet, blew compressed air to the tank, re-filled the filter with diesel, then took a transfer pump and drew fuel up to the IP.
A few squirts of ether and she started right up.
Anyway, sorry for the play by play, but it sounded like almost the same scenario I had, but no wrecker body.
Good Luck.