1998 Fld120 Detroit 60 crank no start even with either

Let me start off with my problems, two weeks ago had to get towed ended up having to replace bull gear, crankshaft timing gear and air compressor. Truck didn't jump timing so pretty easy fix after a week in the cold. Truck ran good a few days then had low voltage the week after, ended up being bad batteries replaced batteries, double checked all connections truck ran fine for a few hours got home and idled for about 25 minutes and truck shut down and wouldn't start! Truck will turn over good and fast just won't start.
It's a long story of a problem but the short side of the story. Done tried test ecm, Battery connections good, power to ecm. Changed fuel filter, changed trs sensor. Looking for fuel check valve but looks like I don't have one on my truck But its been running fine without check valve!

 

Any advice and suggestions would be greatly appreciated I've been going thru he'll trying to figure what's going on!

 

I'm going to try to replace sensors tomorrow, sounds like it wants to start but doesn't!