How to pressurize the fuel tank?
 

In my battle to get my truck up and running how do you pressurize the fuel tank to determine if fuel is flowing out of it? I need to make sure my lift pump is getting fuel to it.

Infidel, from the 12-valve forum, had the following to say:
…what I did, drill and tap a port in the top of a extra fuel cap to hook the air up to.
Works excellent for finding leaks also. 10 psi max, don't want to blow up the fuel tank. Priming it this way the fuel flows from the tank though both the feed and return lines which makes imperative that you open the bleed screw on top of the filter as any air has nowhere to go. With a fuel tank on the full side this method takes about 15 seconds to fill the filter and purge air…

You want to pressurize your fuel tank?

Take an inner tube and cut off a circle around the valve stem about 8-10" in diameter. Clamp this piece to the filler pipe. Air it up!