I believe I have narrowed my lean issue to the fuel pump. But I have 2. One factory and one that came with the Vortech Supercharger. So do I replace one or both. If I replace one how do I figure out which one? I have a 01 F-150 HD. I just got it and I don’t know the history.

 

Are you sure the fuel filter isn't plugged?

 

I replaced that and the pcv.

 

Not sure of your setup, but you may want to verify how to auxiliary fuel pump was wired up. Case in point, I have two Walbro 450lph pumps with one running all the time. The second pump only turns on when I reach a couple psi. I would check for a fuse to the second pump.. You need to determine how your pumps are wired, fused and possibly relayed, especially that second pump. Could be something as simple as a fuse to the second pump. If it's only lean under boost, start with that second pump.

 

I couldn’t find the fuse for the second fuel pump so I just disconnected the wire and it would not start at all. So I replaced the in tank. I think that fixed the issue but I have not tested it yet. I still need tires and shocks. Thanks for the advice.