One of the golden rules in veg oil conversion is to make sure the vehicle is top notch before conversion.

If you have no experience replacing an injection pump, or diagnosing, perhaps take to a local MB repair garage.

Where are you located?
What is the status of this project?

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85 300D 3 pedal. Current project.
83 300TD (need rear wiper assembly dead or alive)
84 300SD Daily driver
85 300TD almost 400k miles and driven daily.
98 E300D *sold
86 300SDL *sold and made flawless 10 hour journey to new home.