Have you replaced the battery then? Or got a spare to try? Or test your own? Have you checked leak offs and all the other fuel piping?
Also you mentioned you retarded the pump because it had that famous diesel clattery type sound we all love. It is supposed to sound like that in the mornings when its cold, and it will go away as it warms up. That little bit of advance you had might of been helping your cold starts to no end. Now you retarded it back your having trouble? Really just thinking aloud now...
Get a video aswell, that will help us.
I might br wrong but i just had a quick skim over it all but no ones mentioned glow plugs yet?
Also you mentioned you retarded the pump because it had that famous diesel clattery type sound we all love. It is supposed to sound like that in the mornings when its cold, and it will go away as it warms up. That little bit of advance you had might of been helping your cold starts to no end. Now you retarded it back your having trouble? Really just thinking aloud now...
Get a video aswell, that will help us.
I might br wrong but i just had a quick skim over it all but no ones mentioned glow plugs yet?
Doesnt even own a 306.