1984 Cadillac Fleetwood with diesel engine won't start.

Have a 84 Cadillac Fleetwood Brogham with diesel engine and pretty sure it stalled
because of gelling of fuel line's/filter. I replaced filter and put 911 diesel engine
additive in filter and tank. It has also warmed up too where I know it's not cold
weather. There is no check engine warning light or water in fuel lights on except the
usual dash indicator lights that come on when first turn key on. Still won't start, will
crank but not start. Acts like it's not getting fuel but pulled fuel filter off and there
seems to be fuel getting to intake on top of engine. Very frustrated and confused!
Anything to help would be greatly appreciated! Thank you, Brian