How can I get my 1996 Ford diesel truck started? I haven't driven it that often. on 1996 Ford F-350

I haven't driven the truck often. When I parked it, it was fine but water in tank light was on. The filters were changed. The tanks were cleaned out and fuel pumps changed. Batteries (2) are new. Could it be the fuel line or what could be wrong?

Asked by for the 1996 Ford F-350
you could have air in system or poss fuel pump is locked up. seek fuel pressure test to start with
1 more answer
give it a shot of ether through the air cleaner but not too much and see what happens