The first picture in this thread clearly shows the line used for wet level measurement. It's approx. 1/2" long, right below the word "corp"
http://www.vmaxforum.net/showthread.php?t=5834
PROCEDURE: Make 2 tic marks on a piece of clear tubing, one at 15mm and one at 17mm from the end, attach tubing to your float bowl drain hose, place the end with the tic marks at the line on the carb, open the drain screw and the fuel should rise to a point between those tic marks. I prefer a leaner setting (closer to the 17mm mark)
Turn the key on a couple times to cycle the fuel pump making sure fill the float chamber stays full.
http://www.vmaxforum.net/showthread.php?t=5834
PROCEDURE: Make 2 tic marks on a piece of clear tubing, one at 15mm and one at 17mm from the end, attach tubing to your float bowl drain hose, place the end with the tic marks at the line on the carb, open the drain screw and the fuel should rise to a point between those tic marks. I prefer a leaner setting (closer to the 17mm mark)
Turn the key on a couple times to cycle the fuel pump making sure fill the float chamber stays full.