[andyg]

Is your fuel tank AL or steel? My freightliner has aluminum saddle tanks. The wall thickness was enough that NRC simply drilled and tapped holes for suction and return lines into the top of the tank. If you have a steel tank which will be much thinner you can weld a fitting into the top, use the bottom plug with a stand pipe (volvoman) or use the bung fitting (hot rod). The bung fitting would probably be the best. You should be able to access the inside of the tank by removing the gauge sending unit and pickup. This usually leaves a hole large enough to reach your hand into for installation of the fitting.