original GP-FUEL Diesel Unit Injector 10R-1262 for 3126 3126B 3126E C7 Engine Replace 222-5965 222-5966 0R-9348 131-7150  original new injector

Engineered specifically for the 3126, 3126B, and 3126E HEUI diesel platforms produced between 1995 and 2004, this remanufactured 10R-1262 / 10R1262 hydraulic actuated fuel injector delivers OE-style fit and function for professional diesel repair operations. The HEUI system relies on high-pressure engine oil to hydraulically actuate the injector while the electronic control module precisely manages injection timing and fuel quantity, making correct injector specification critical for stable combustion and consistent engine output. With broad cross-reference coverage including 222-5963, 2225963, 203-3771, 2033771, 204-6714, 2046714, EX631262, and the CA-prefix equivalents, this unit provides reliable coverage for distributors, fleet maintenance companies, and engine rebuilders servicing the 3126 series.

Common failure symptoms such as hard starting, rough idle, white or black smoke, misfire, power loss, high fuel consumption, fuel dilution in oil, engine knock, and excessive return flow frequently trace back to worn HEUI injectors suffering from nozzle deposits, internal leakage, poor atomization, or compromised oil actuation. Technicians are advised to scan ECM codes, verify high-pressure oil rail performance, test fuel pressure, and inspect the injector harness before and after replacement. Routine maintenance of clean diesel fuel, proper filtration, scheduled oil and filter changes, drained water separators, and secure electrical connections will help protect the HEUI injection system and extend service life.

Built for heavy-duty industrial, commercial truck, construction, and agricultural applications, this remanufactured 3126 series injector is widely used in core-exchange programs and aftermarket export channels serving North American, Latin American, Middle Eastern, African, Southeast Asian, and European markets. Each unit is assembled and inspected to meet remanufacturing quality standards for the 10R-1262 / 10R1262 family, supporting engine rebuilders and parts distributors with a dependable replacement solution for the 3126B and 3126E HEUI engine range.