fuel Fuel Injection Line Kit with Clamps For Caterpillar 3406 3406B 3406C 1917941 Posted on December 31, 2023 by admin 1 qty – #1 Fuel Line (OE # 7C3421, 4P9661, 1917941, 4P3921). Part Type : Injection Line. 1 qty – #2 Fuel Line (OE # 7C3422, 4P9662, 1917942, 4P3922). 1 qty – #4 Fuel Line (OE # 7C3424, 4P9664, 1917944, 4P3924). 3406b 3406c caterpillar clamps fuel injection line