Well, even though it's been troublesome, I'm really happy with the way the fuel lines have been coming out. So pleased, in fact, that I decided to redo the vent lines. After taking some measurements, here's the first attempt.

Hrm...apparently I mis-measured one dimension. The horizontal run near the firewall is nearly four inches too long.

...and the loop is a bit too high as well. No problem...I ordered a roll of the 1/4 inch tubing as well. Hopefully my order from Aircraft Spruce will get here soon.