Mercedes Benz repair: 1980 mercedes 300cd - fuel, mb diesel, biobor

Question
have a 1980 300cd converted to run off of veggie oil - recent probs with vacuum lines fixed at a shop - have found that the fuel filters have been clogging very quickly, probably due to bad oil - recently had to change both the car filter and the conversion-added filter due to sludge etc in the oil - now everything is new, new filters all around, and cannot get it to start - does not want to get fuelk from tank apparently - is there a filter in the tank or something else that i should know wbout to change/clean? i am going back to straight diesel as this system has been nothing but headaches but I cannot even start my car to get it out of the garage - almost turns over but not quite - how do i check the fuel supply, what do i check, what do i replace - help! tom- 602-367-3865

Answer
MB diesel filtration, how it works.
http://www.mercedesshop.com/shopforum/showthread.php?p=1055075#post1055075

I'm baffled and at wit's end!?!?!?!?!
http://www.mercedesshop.com/shopforum/showthread.php?t=138961

Algae/Fungus fixation...
http://www.mercedesshop.com/shopforum/showthread.php?t=138733

Check out this fuel pickup screen
http://www.mercedesshop.com/shopforum/showthread.php?t=140961

Biobor, what is it, why do I need it?
http://www.mercedesshop.com/shopforum/showthread.php?p=723857#post723857

Filters, Fungus, Biocide, etc.
http://www.mercedesshop.com/shopforum/showthread.php?p=823378#post823378

Algae Clogged Filter Pic StarTron WORKS !
http://www.mercedesshop.com/shopforum/showthread.php?t=138728

Biodiesel and WVO - SVO links thread.
http://www.mercedesshop.com/shopforum/showthread.php?t=111689