Ok i have in this picture the fuel feed and return line i know the feed line is bigger than the return one but my question is what size thread with a barbed end do i need for each one i know the return line is 5/16 and the feed is 3/8 barbed end what about the end that attaches to the stock lines coming from the car?

anyone know?

Sorry. I looked through several records from TPI conversions I have done and i did not record the Dorman part numbers. My invoices only show that it was a Dorman part from Autozone.

I simply got metric to barb brass fittings at local hardware store in the plumbing section (think it was an ACE Hardware).

ok there metric that explains why i couldnt figure out the size does anyone know what metric size fitting screws into them?

what is it exactly that you're doing? is this a carb conversion and u plan on running rubber from the barb? Last one I did I got fittings to attach the lines to my 3 port regulator and ran the new feed line from the regulator to the carb...

yes i am converting from tpi to carb and yea i want to run rubber hose from the barb like you said sorry for not clarifying that earlier.

They are called saginaw fittings in 16mm & 14mm X 1.5(?).

ok thank you i found them on summit

What he said. In the TPI fuel rail mod thread the mention 16 and 14mm x 1.5. I'm still a little confused because one person mentioned 1.5 and another 1.5 o-ring. Does anyone know if the lines have the o-ring fitting? Thanks.