Outer Limits 4x4 Board

Here's a quick leadup story
Stopped driving about feb 2004 and started stripping, no probs with smoke(apart from black!! love it!!!)
When to derka derka land for 6 months, came home started the car started first go with no smoke.
took about 6 months on and off rebuilding it, got it on the road and it started blowing bluey grey smoke, it had about 10 lt of fuel in it for about 6 months so i thought water in fuel.....changed filter....worked for a while....came back.....went for a drive on about 60 klms of corrogations, got to the beach and it had fixed it self, yesterday removed fuel pick up...bit of dirt and gunk, not much, removed it and cleaned thoughly....fixed the problem...went out today ITS BACK AGAIN!!!!!!
what is going on??????
any suggestions would be great.

im assuming its a TD42, could be a leaking fuel line sucking in air...

yeah diesel, possible, im gunna get the injectors done and the pump checked when we move to brissie in 4 weeks!!!! ill have a look though cheers
anyone else got any ideas

Have you try some fuel addative thats kills bacteria, as bacteria build up thru all the lines when sitting for any lenght of time