I got my donor truck home today. We hauled it in to be on the safe side, never know what you may be getting into. It is a 88 Ford 3/4 ton Wonder Bread truck. After driving it about 12 mi I found that the injection pump has a slow but steady drip from the device that looks like it may have a diaphragm on the top of the pump. There is a small fitting on the back side under the cover of this device that has a rubber cover with a drain tube on it that is leaking. What is this and what can I do to fix it? I hope I havent done to bad of a job of explaining this. I belive this is what you guys call a VE pump.