fuel Fuel Injection Line Kit With Clamps 1917941 Fit For Caterpillar 3406 3406b 3406c Posted on January 16, 2024 by admin 1 qty – #1 Fuel Line (OE # 7C3421, 4P9661, 1917941, 4P3921). 1 qty – #2 Fuel Line (OE # 7C3422, 4P9662, 1917942, 4P3922). 3406b 3406c caterpillar clamps fuel injection line