Rodney's gas tank sending unit (Page 1/1) GTPCAR APR 25, 03:17 PM After installing Rodney's gtsu I found the output from the pump is fabricated using 5/16"dia. tubing ( which requires using 5/16" ID hose from the tank hardline to the fuel filter ). The Fiero OEM output is 3/8" dia. Will this smaller dia. tubing still support the flow rate needed with an engine swap ( in my case LFX )? The remainder of my fuel supply line ( EP 381 pump, Wix 33737 filter/regulator, hardline, and hose rated for fuel injection is all 3/8" ID.