My '92 F250 wtih 7.3L diesel starts then shuts down immediately. It takes about 3 cranks to get it to run, then it is fine to drive. I replaced the fuel lines (plastic) as the old ones were leaking, and that is when this problem started. It would always start up good before this. I have replaced the fuel filter and o-rings in the drain tap bowl as these were damp. Any ideas?

92 and 97 have completely different injection syatems. I agree with the air getting into system on the 92. the fuel pump has a check valve in it' the valve may be bad allowing fuel to drain from the fuel filter housing, Could even be a pin hole in a line between fuel tank and injection pump, follow lines back to tank, see if you see any moisture on either the feed or return line, these have a history of rusting, may be a pinhole onder the rust> Let me know if this helps

Not an expert on diesels, but I believe you are bleeding down when it sits.
Could be slight leak at one of the fittings. Air can get in without fuel necessarily getting out, especially with the turn like from the pump to tank.
I believe there is also a "lift pump" for the fuel on the side of the engine block.
Tighten all those fittings as well.

I have that same issue and mine is a 97. I think its either injection related or the high pressure oil pump my buddy's just went out and its doing the same thing our trucks are doing. the best bet is to get rid of your truck or pay 2600 bucks unless your a skilled mechanic or know someone who can do it for cheap because the parts only like 20- 100 bucks