I was wondering what size rubber hoses are used for fuel lines, vapor lines and vacuum lines. I was also wondering what size hose goes over this brass fitting. And lastly what color spring clamps go where. Particularly on a 1972 4 barrel 350. I don't have the factory TCS Switch or quadrajet so a general idea of where they are suppose to go would be great. Thanks in advance!

 

Vacuum lines are usually 5/32. Fuel line should be 3/8 feed and 5/16 return line. These are inside diameter measurements. I am also curious about where to find the correct size spring clamps for the fuel lines. Right now I have standard hardware store clamps and I would like to replace them with the correct spring clamps.

 

I found the correct fuel line clamps at the hardware store.

 

Thanks for the tip. I also found the correct clamps at the local Ace hardware. The info I found said the 5/16 fuel line should use the black 9/16 clamps and the 3/8 fuel line should use the tan 5/8 clamps. On the 5/16 fuel line I found the black 9/16 clamps were too loose so I used the red 1/2 clamps. The tan 5/8 clamps did fit the 3/8 fuel line good though.