Fuel Pump/Line Help

I currently have a Carter mechanical fuel pump (http://www.summitracing.com/parts/CRT-M6270) and had a hose barb on the inlet and outlet. Well I want to run a hard line (or possibly even braided steel hose with AN fittings) from the fuel pump to the carb. I am having a problem though, every 1/4" NPT fitting I have tried on the outlet (or inlet) side of the pump does not fit. ](*,) The outlet has a -20 thread and all the fittings are -18 thread. I am looking for a fitting that is 1/4" NPT (male) on one side and an 5/16" inverted flare (female) on the other, but some how has a -20 thread on the male side.I have not been able to find anything like that. Should i be looking for a different pump maybe? Does anyone know of a fuel pump that actually works with 1/4" NPT fittings?

Thanks