Worked on the fuel line from servo to red cube. Aircraft Spruce sent one wrong fitting; ordered an AN816-4-4D nipple but they sent a 3-flare Tee fitting in a mislabeled bag. Mocked up lower fuel line using fittings and tape to check required length. The Aeroquip 666-4 fuel line did not work with the 491-4 fittings. Fabricated a fuel line with 1/4" tubing; wrapped with firesleeve, heat shrink tubing and bands. Ordered new hose from Aircraft Spruce; may make up new lower hose when new order arrives.