Installed the fuel line vent system. Added a "T" fitting and AN-3 elbow at the fuel pressure regulator. Routed 3/16" aluminum tube across the firewall to the left side and about halfway down to the through firewall union. Routed a 3/16" aluminum line from the union on the cockpit side of the firewall to the fuselage side near the main fuel line. Routed the 3/16" line through a grommet for chafing protection. The line will be cut to proper length when the wings are installed. A restriction will probably be needed in the line to limit. The restriction size will be determined later when the return line flow is checked and the ability to vent air and vapor is evaluated.