Fuel injection pump on 230sl

[srisant]

Hi, my fuel pump PES 6 KL 70/120 R11 is in bad shape and it is very difficult to get one. I have seen several pump for 250sl PES 6 KL 70 B 120 R18 works on 230sl with adjustment of fuel level? If not can any of you suggest a reliable place for me to get it fully rebuild or exchange? Many thanks

[ja17]

First check to see if both pumps have their own oil supply or if the later one has the engine oil circulating through it.  I believe the later pumps can be used if you have someone really good at setting up the mixture adjustments.

[Tyler S]

The R18 pump does have the self contained oil supply with dipstick. As far as it working on a 230, it will "work" but you may run into problems with the air/fuel curve that is governed by the different mapping of the space cam.

[Benz Dr.]

Used pumps are out there. I wouldn't put anything except the right part on it.

[Shvegel]

I'm with Dan.  The "Space Cam" is a 3 dimensional steel map of the fuel requirements that takes into account the anticipated load and speed of the engine.  Putting a pump on with a different space cam in it opens up a lot or room for problems.  If you consider that you already have a used pump and that the youngest of these pumps is 45 years old you will probably be on borrowed time anyway.  you might be able to get by for a while but eventually you will be better off rebuilding what you have.  Hans at H and R fuel injection or Gus at Pacific fuel injection are both names that seem to come up when rebuilding is needed.