What you have removed is one of the injection pump elements. Notice the slotted holes that hold-down studs went through--this is the adjustment for the volume of the particular element. The adjustment needs to be made on a flow bench at a fuel injection shop.
What I am saying is, no, you should not have removed or even loosened that part, and now you need to remove the IP, take it to a diesel injection shop and have it calibrated. You can't get it right without a flow bench. They will be able to fix your fuel seep at the same time.
I know this probably isn't what you wanted to hear, but it's the truth.