I'm new to the site but need info to understand a problem that I have. I have a 2005 ford f550 that is not receiving fuel in the top bowl when I crank it. I bought a new fuel pump and put it on. The new pump has two connectors and the old pump has three. What I don't understand is what to do with the third harness and what did it give power. Since I put the new pump on I have yet to see fuel in the bowl. Please advise.