[rhodog77]

Vintage,

all 3 lines are different sizes. the largest, 3/8 line is for the main fuel supply. The middle line is 5/16 and is for the return and the smallest is 1/4 for the vent. The important thing is that the lines should match up to your fuel pump. Now, some of the guys that I run around with only use a main line and plug the return up at the fuel pump. It works for them but I figured that if my s10 had 3 stock lines, that is what I was going to do as well. Mine is running very smooth with good pedal response. I got your PM, glad to know you got the spacer.....I hope it works for you. My gauges did not come with a fuel pump, just the sender.