Ok can anyone tell me the hard fuel line size for the feed 2 the fuel filter i have the stupid double top fittings and want 2 convert 2 a aftermarket an filter but need 2 know the hard line size b4 i order the fitting. Oh ya its on a 93 civic hatch cx if that makes a diff. Thanks in advance

you could always just run a short piece of flexible tube (if you use rubber make sure it is fuel line & not radiator hose -- fuel will eat through a rad. hose eventually) after the hard line.

or go out and measure it yourself.

5/16" IS THE HOSE SIZE OR 8MM.. USE HIGH PRESSURE FUEL HOSE. IT'S ABOUT $2 BUCKS MORE FOOT. REGULAR FUEL HOSE IS MENT FOR LOW PRESSURE MECHANICAL PUMPS IE. FORD CHEV. IT WILL BUBBLE THEN BURST UNDER YOU ELECTRIC FUEL PUMP PRESSURE. THEN USE BARB END FITTINGS TO SPLICE INTO YOUR FUEL LINE.ALSO 5/16"