I just recently acquired an 87 300TD, a rare beast indeed, for the ridiculous price of $500. This car is far from a driver yet, and I must admit I scooped this car up on impulse. It has a large laundry list of problems that need to get sorted well before it could ever be road worthy. Here is the general list, in order of importance:

1) Injection pump issue for cylinder #5
2) Clean/seal/install fuel tank
3) Rebuild SLS
4) Interior/doors/windows etc...

I did get the car running and actually drove the car onto the trailer to bring it home. Started working on number 1 above and here is what I have found. Number 5 cylinder is dead, and I have determined the #5 injector is not firing at all. With the car running and cracking the lines loose at the injector, all injectors are receiving good fuel pressure, ie each line spits fuel a couple of feet in the air, except for cylinder #5. When I crack open number 5, there is a weak dribble of fuel with LOTS of air bubbles. I have already taken #5 injector line off and removed the delivery valve nozzle and spring to clean them and make sure they are clear of debris. I noted there is rust inside the fuel system - the line and DV nozzle had signs of rust inside. There obviously has been some water exposure to the innards of the fuel system, which explains why the PO removed the fuel tank and never re-installed it. Short of replacing the IP with a good used one, is there anything else I can do to try and revive the existing IP? Can I remove the delivery valve under the nozzle for inspection? What would cause air bubbles on only one injection line? There isn't a lot of DIY info on mechanical diesel injection pumps or even much info on how they work. I obviously don't want to throw a bunch of money at this car, as it is never going to be a really nice car. Does anyone have a lead on a good used (cheap) injection pump for an OM603??