77 240D(std tran.) omitting blue/white smoke--- Why??

[miamimike]

Hi Guys(and women)need some advice on WHY this happening. A little Vehicle history; bought the car off a guy 5 months ago-it had been sitting in a florida barn for a while...the car starts hard-needs about 15 seconds of cranking-exactly and it fires up and idles pretty smooth.after the purchase,changed the oil,glowplugs, injectors, belts& hoses.Still smoked. Then a local(but not certified MB) mechanic pulled the head and had it shaved and supposedly changed the valve seals--everything back in place--it still smokes-a white/blue smoke. Not much smoke on idle but if you rev the motor a few times it spits out this white/blue smoke. Have 50wt. oil in the crankcase(new) along with a new filter. Had another mechanic(asa cert.) run a compression test--have 315 across all 4 cylinders. I noticed the small primary plastic filter only is only about 1/3 full of diesel at idle and on another MB diesel this was almost full. I disconnected the fuel line completely at both ends--blew it out front to rear and a glob of rust goop came out. I tried to blow the fuel line from rear to front and hardly any air passes through-maybe the reason for the primary(little plastic) filter only 1/3 full of diesel at idle. When I drive the car-in 1&2 gear-it appears starved for fuel--just won't accelerate--could this fuel starvation problem be causing the blue/white smoke?? The hard starting problem-maybe due to the valves out of adjustment?? Could this be a cause of the smoking?? Any advice would be greatly appreciated?? BTW--I pulled the gas tank from the trunk--)it is one of those 37 gal. square tanks that MB sold in that era I am told.)---I cleaned the tank--but did not see a filter-so that wasn't cleaned. This is driving me crazy.!!!!!!!!!!!!!!!!!!!!!!1