Coolant leaking from fuel injector?

I have an 86 300SDL and yesterday spotted a small pool pf coolant when i returned to the car. I looked underneath and could not find a leak and when i got it up on ramps later i found the coolant was dropping off the transmission. Fairly confused, i followed it back and finally found it running between the injection pump and block and a puddle around the #3 injector and nowhere else. Serious problem? Also, when looing between the injection pump and block i could see attached to the pump is a lever with a spring on one side running towards the rear of the car and a head on the other end of this lever, sametype as the accelorator linkage uses to pop on connectors. But there is nothing attached to this head. Is there something missing? I could not find rods in there not connected. I can't imagine putting a connection point with a spring return on something that doesn't connect to something else. Thanks for any info, Shannon