This is a basic fuel system schematic for a turbo injection set-up.

Fuel feed line from tank to pump should be at least a -10 AN

Use as few a number of fittings as possible, stay away from forged aluminum fittings and when necessary use only mandrel bent tube ends. 

Use only high quality hose end fittings, some of the less expensive hose ends have smaller inside diameter than the preferred more expensive hose ends.