I just put a "T" fitting in the fuel cell pickup line, but that's assuming that you are running a cell. All it has to be is between the tank and the engine, or at least that was the wording a few years ago when I did mine.

I didn't want it on the high pressure side of the system, so put the "T between the facet pump that draws the fuel from cell to the sump tank, then to the stock pump.