Anyone know why I my injector pump is leaking from a little rubber drain tube on the back of the bowl where the fuel pin is located?

 

Well i have not had that issue i would suspect it be caused by a bad seal for the pin that is metered by the fuel pin itself.

 

So is there a way to replace that? It should just be a little O ring right? Or are talking about the actual diaphram? Also, seems like where it's leaking is a drainage tube that is supposed to allow fuel out of that bowl under certain conditions.

 

I am not sure on the oring i have not encountered this leak before. I bought complete Bosch oring kit for like 35 bucks. Its not very hard to take the top of pump off just know how and patience. While your in their you could do the 3200 spring!