I agree, most likely fuel related. You said you changed filter, I'll assume fuel or air. There are actually 3 fuel filters in the fuel system. Have you changed them all, especially the one in the fuel tank which is the one that is most commonly neglected??? The main and prefilters need to be changed often, at least every 10K at a minimum.
Also, if you suspect your shut-off valve, I'd get a replacement just to rule that out. The mechanical fuel pump on the side of the injection pump rarely goes bad, but worth diagnosing by removing fuel line at top end of pump and check for spray. Also consider doing a diesel purge (use a search to find out how) using at least 2 cans of LM.
Finally, make sure your glow plug relay is working and heating all 6 plugs. Otherwise, a cold diesel is very hard to start.
i could not agree more that it must be fuel related, a diesel getting fuel injected just has to run, there is no other option. and its not like this is a sick motor or anything, at 212 k miles there is no visible blow by whatsoever.
yes filters are all new. i do have an electric lift pump running at 10 psi and i do have plenty of fuel entering the ip, removed fittings at the filter housing. also i can see that i have return fuel coming out of the ip.
glow plugs are good as well, even heated the engine this morning with a heater to make sure, it was still a no go. and we had it at 65 f here in florida.
in a while when my neighbor is home i again want to check how much fuel arrives at the injector. i initially thought i had none, but this morning i put a clean t shirt underneath and i have a little coming out. its just i could not see how much with my own eyes.
so i will post later on my findings.................
oh my sov is purely vac operated, its not like the older ones which had a lever on top of it all. also all my delivery valves etc are upgraded to viton.