My72Cutlass

I have a 1972 Cutlass Oldsmobile 2 door hard top, When I removed the body from the frame I only seen 2 fuel lines running down the frame...... I now dont know if it was the main fuel line and vapor line OR the main fuel line and fuel return line..... my tank has 4 ports, 1 that is from the sending unit...... So I guess my question is did the 72 cutlass with the 1 port from the sending unit come with a return or not...... Thank You Guys!!!!!

RetroRanger

of the four lines on the gas tank 3 vents go to the canister behind the rear seat the fourth is the fuel line. the other line on the frame is a vent too (at least on my car 72 CS)

My72Cutlass

So than the 2 lines that run down the side rail of the frame are 1) the main fuel line and the 2nd) the vapor line going from the vapor seperator tank to the charcol canister at the front..... and there is no fuel return line than correct???? Thanks

hookem horns

Small blocks have 1 line and big blocks have 2. Look at the fuel pump to see if there is a return.

RetroRanger

yes my olds is an SBO so that fits what hookem said too

My72Cutlass

Thanks guys, I think I have a small block, due to just 1 fuel line, but will check when I get home..... working at a car dealership doesnt give me the most time to spend at home and work on my project..... This site has been very helpful,. Thanks again!!!!!!!