1972 280SE 4.5 - fuel line sizes
 

I went through all my literature and couldn't find the correct size for the fuel lines all the way from the tank for the rail.

Fastlane has about 10 different sizes, not of which are marked as FI. Does the number of different sizes available reflect the number of sizes actually used? I hope not.

What size are the small pieces between the rail and the injectors?

Thanks for the help!

The official size is 7.5mm internal diameter. I have successfully used NAPA 5/16" aka 7.9mm fuel injection line. Do not use their ordinary 5/16" fuel line. May not stand the pressure. Actually I have found 7.5mm to be too tight a fit.

thanks
 

thanks bill!