I have a 90 350 vortex..
My question is: which of the two fuel lines is the inlet? I assume there is a differance,since one is the return line to the fuel tank....
I've looked everywhere,in haynes,ask someone..could someone please fill me in !!!!
as alwayz,
Thank you for your support !!!

Doug

The larger of the 2 is the pressure line, smaller 1 is the return.

Merlin,
They are the same size...
Thanks,
Doug

They shouldn't be if I remember right. The pressure line is 3/8 and the return is 5/16.
The line that goes straight into the TBI unit is the pressure line, the return has an almost U or L shaped bend in it.