I drilled out & soldered in larger fittings into the 2 vertical "wells" in a stock pump to run 3/8 lines/fittings. Class rules require a stock "airtex" type SB pump EDIT regular lengths of parts store 3/8" inverted flare fuel line would not screw into the pump smaller female inverted flare fitting that was for 5/16" lines so I eventually decided to drill out the pump.