Caterpillar C13 Fuel Injector 348-4090 Product Detail Page Description The Caterpillar C13 fuel injector 348-4090, also written as 3484090, is a heavy-duty diesel fuel injector designed for CAT C13 series engines used in industrial engines, generator sets, power train packages, construction machinery, excavators, and heavy-duty diesel equipment. Public parts-catalog references identify 348-4090 Injector GP-Fuel for Caterpillar C13, C13 XQ350, and CX31-C13I applications, including C13 Industrial Engine, C13 XQ350 Rental Generator Set, and CX31-P600-C13I Petroleum Power Train Package references. This injector is built for buyers who need a direct replacement diesel injector, OE-number-based parts matching, stable fuel atomization, reliable combustion control, and industrial-grade durability. It is suitable for professional diesel repair shops, engine rebuilders, fleet maintenance companies, construction machinery parts distributors, generator service companies, and global aftermarket spare parts suppliers. Before ordering, always confirm compatibility by engine model, engine serial number, equipment model, injector part number, fuel system type, and injector appearance. Caterpillar parts should be verified by serial number through an official CAT parts channel when exact fitment is critical. Caterpillar’s official parts portal supports part searches by category, part number, or serial number.