fuel line questions

[mwalsh]

I started running the fuel system in my PSD Bronco today, but have a question.

I removed the lines from the donor and put them into the Bronco and connected the high pressure coupled lines under the oil cooler. My question is, which one is the supply line? Common sense tells me that its the thicker of the two that run up the block, but then I question it because they are the same size the rest of the way back. I was hoping that someone might be able to answer this for me so I dont have to tear things apart trying to follow the lines up