Here's the fuel pump I'm going to use. It is an electric in-line pump recommended for the 4d55. It even comes with the mounting bracket and hardware. Here are the part number and specs:

Fuel Pump:
NAPA # NFP P74029
Contents : Hardware Package
Fuel Pump Gallons Per Hour : 16.8
Fuel Pump Line Size : 3/8"
Fuel Pump Pressure Rating : 3.8 - 5.7

I'm going to mount it under the truck near the fuel tank. I need to crawl under and see if I can find a position where it will be under a skid plate or at least protected by the frame. I may put an inline fuel filter between the tank and pump... not sure yet.

-Pmontero