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Thumbnail Filmstrip of 2017-2023 6.6L L5P Duramax L5D Driver Side Fuel Injection Fuel Rail GM 12686810 Images
L5P|L5D Duramax Driver Side Fuel Injection Fuel Rail | GM 12686810
Genuine GM OEM driver-side high-pressure fuel rail for 2017–2023 6.6L L5P Duramax engines. Direct-fit replacement that includes the factory-installed fuel pressure regulator.
Description The GM 12686810 is the OEM left-hand fuel injection rail for the L5P Duramax common-rail system. It feeds the four driver-side injectors and includes the integral fuel pressure regulator, which GM does not sell separately. Replaces 12678991. Use this rail to correct leaks, regulator failure, or fuel-system contamination. Injectors are not included. Professional installation is recommended.
Features
- Genuine GM / ACDelco 12686810
- Replaces 12678991
- Driver-side / left-hand rail
- Includes factory fuel pressure regulator (GM 12686811)
- Direct-fit aluminum OEM assembly
- Feeds four left-bank injectors
Fits
- 2017–2023 Chevrolet Silverado 2500HD / 3500HD 6.6L L5P
- 2017–2023 GMC Sierra 2500HD / 3500HD 6.6L L5P
- 2019–2023 Silverado / Sierra 4500HD, 5500HD, 6500HD L5P / L5D Confirm by VIN. 2024+ L5P uses 12731370. Passenger-side rail is 12686808.
Includes
- Driver-side fuel rail
- Factory-installed fuel pressure regulator Not included: injectors, lines, fittings, or passenger-side rail.
L5P|L5D Duramax Driver Side Fuel Injection Fuel Rail | GM 12686810
Genuine GM OEM driver-side high-pressure fuel rail for 2017–2023 6.6L L5P Duramax engines. Direct-fit replacement that includes the factory-installed fuel pressure regulator.
Description
The GM 12686810 is the OEM left-hand fuel injection rail for the L5P Duramax common-rail system. It feeds the four driver-side injectors and includes the integral fuel pressure regulator, which GM does not sell separately. Replaces 12678991. Use this rail to correct leaks, regulator failure, or fuel-system contamination. Injectors are not included. Professional installation is recommended.
Features
Genuine GM / ACDelco 12686810
Replaces 12678991
Driver-side / left-hand rail
Includes factory fuel pressure regulator (GM 12686811)
Direct-fit aluminum OEM assembly
Feeds four left-bank injectors
Fits
2017–2023 Chevrolet Silverado 2500HD / 3500HD 6.6L L5P
2017–2023 GMC Sierra 2500HD / 3500HD 6.6L L5P
2019–2023 Silverado / Sierra 4500HD, 5500HD, 6500HD L5P / L5D
Confirm by VIN. 2024+ L5P uses 12731370. Pass[...]
L5P|L5D Duramax Driver Side Fuel Injection Fuel Rail | GM 12686810
Genuine GM OEM driver-side high-pressure fuel rail for 2017–2023 6.6L L5P Duramax engines. Direct-fit replacement that includes the factory-installed fuel pressure regulator.
Description The GM 12686810 is the OEM left-hand fuel injection rail for the L5P Duramax common-rail system. It feeds the four driver-side injectors and includes the integral fuel pressure regulator, which GM does not sell separately. Replaces 12678991. Use this rail to correct leaks, regulator failure, or fuel-system contamination. Injectors are not included. Professional installation is recommended.
Features
- Genuine GM / ACDelco 12686810
- Replaces 12678991
- Driver-side / left-hand rail
- Includes factory fuel pressure regulator (GM 12686811)
- Direct-fit aluminum OEM assembly
- Feeds four left-bank injectors
Fits
- 2017–2023 Chevrolet Silverado 2500HD / 3500HD 6.6L L5P
- 2017–2023 GMC Sierra 2500HD / 3500HD 6.6L L5P
- 2019–2023 Silverado / Sierra 4500HD, 5500HD, 6500HD L5P / L5D Confirm by VIN. 2024+ L5P uses 12731370. Passenger-side rail is 12686808.
Includes
- Driver-side fuel rail
- Factory-installed fuel pressure regulator Not included: injectors, lines, fittings, or passenger-side rail.