I have a 91 jetta gl non turbo and i purchased the car a month ago. I have had 11 vw diesels. In the last month I have driven the car about 4500 miles to Canada and back. Yesterday when i attempted to start it it took literally 2 minutes for the pump to draw the fuel up and then the car started and putted and then ran and I drove it to work. After 11 hours of work it did the same thing. This injector pump is slightly different than ones on my previous cars. It has a "pod" on top with vacumn lines going to it and then run to the passenger fender well where there is some sort of valve with one vacumn line and one wire. what is that stuff? Please advise am i looking at a pump rebuild or is there something else possible?