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L5P|L5D Duramax Driver Side Fuel Rail — GM 12731370
Genuine GM OEM high-pressure diesel fuel rail assembly for the driver (left) bank on 2024–2026 6.6L L5P and L5D Duramax engines. This is the factory RAIL ASM-HIGH PRESS DSL F/INJN used on late-model Silverado and Sierra HD trucks. It stores and distributes high-pressure diesel from the common-rail system to the driver-side injectors and includes the fuel pressure relief valve mounted at the rear of the rail.
Fitment
- Years: 2024, 2025, 2026
- Engine: 6.6L Duramax L5P / L5D
- Vehicles: Chevrolet Silverado 2500HD / 3500HD / 4500HD / 5500HD / 6500HD and GMC Sierra 2500HD / 3500HD / 4500HD / 5500HD / 6500HD
- Does not fit 2017–2023 L5P (those trucks use driver-side rail 12686810)
- Replaces: 12725117
What’s included
- Genuine GM driver-side (LH) high-pressure fuel rail
- Fuel pressure relief valve (installed on the rear of the rail)
Why this rail The L5P/L5D common-rail system depends on a sealed, factory-spec rail to hold injector pressure and feed the left bank evenly. A cracked, leaking, or contaminated rail can cause hard starts, rough idle, rail-pressure codes, and injector damage. This OEM assembly restores factory fit, line routing, and relief-valve function without aftermarket geometry changes. It is the correct service part for rail replacement, fuel-system contamination repairs, and injector work on 2024-2026 trucks.
Product details
- Part number: GM 12731370
- Position: Driver side / Left (LH)
- Type: High-pressure diesel common-rail assembly
- Condition: Brand new OEM
- Brand: Genuine GM
Notes: High-pressure diesel lines and rails should be installed with clean fuel-system practices. Replace damaged injector lines, seals, and return components at the same time if contamination or a leak is present. Confirm year and engine before ordering—2024+ rails are not interchangeable with 2017–2023 L5P rails.
L5P|L5D Duramax Driver Side Fuel Rail — GM 12731370
Genuine GM OEM high-pressure diesel fuel rail assembly for the driver (left) bank on 2024–2026 6.6L L5P and L5D Duramax engines. This is the factory RAIL ASM-HIGH PRESS DSL F/INJN used on late-model Silverado and Sierra HD trucks. It stores and distributes high-pressure diesel from the common-rail system to the driver-side injectors and includes the fuel pressure relief valve mounted at the rear of the rail.
Fitment
Years: 2024, 2025, 2026
Engine: 6.6L Duramax L5P / L5D
Vehicles: Chevrolet Silverado 2500HD / 3500HD / 4500HD / 5500HD / 6500HD and GMC Sierra 2500HD / 3500HD / 4500HD / 5500HD / 6500HD
Does not fit 2017–2023 L5P (those trucks use driver-side rail 12686810)
Replaces: 12725117
What’s included
Genuine GM driver-side (LH) high-pressure fuel rail
Fuel pressure relief valve (installed on the rear of the rail)
Why this rail
The L5P/L5D common-rail system depends on a sealed, factory-spec rail to hold injector pressure and feed the left bank evenly. A cracked, leaking, or contaminated rail can cause hard sta[...]
L5P|L5D Duramax Driver Side Fuel Rail — GM 12731370
Genuine GM OEM high-pressure diesel fuel rail assembly for the driver (left) bank on 2024–2026 6.6L L5P and L5D Duramax engines. This is the factory RAIL ASM-HIGH PRESS DSL F/INJN used on late-model Silverado and Sierra HD trucks. It stores and distributes high-pressure diesel from the common-rail system to the driver-side injectors and includes the fuel pressure relief valve mounted at the rear of the rail.
Fitment
- Years: 2024, 2025, 2026
- Engine: 6.6L Duramax L5P / L5D
- Vehicles: Chevrolet Silverado 2500HD / 3500HD / 4500HD / 5500HD / 6500HD and GMC Sierra 2500HD / 3500HD / 4500HD / 5500HD / 6500HD
- Does not fit 2017–2023 L5P (those trucks use driver-side rail 12686810)
- Replaces: 12725117
What’s included
- Genuine GM driver-side (LH) high-pressure fuel rail
- Fuel pressure relief valve (installed on the rear of the rail)
Why this rail The L5P/L5D common-rail system depends on a sealed, factory-spec rail to hold injector pressure and feed the left bank evenly. A cracked, leaking, or contaminated rail can cause hard starts, rough idle, rail-pressure codes, and injector damage. This OEM assembly restores factory fit, line routing, and relief-valve function without aftermarket geometry changes. It is the correct service part for rail replacement, fuel-system contamination repairs, and injector work on 2024-2026 trucks.
Product details
- Part number: GM 12731370
- Position: Driver side / Left (LH)
- Type: High-pressure diesel common-rail assembly
- Condition: Brand new OEM
- Brand: Genuine GM
Notes: High-pressure diesel lines and rails should be installed with clean fuel-system practices. Replace damaged injector lines, seals, and return components at the same time if contamination or a leak is present. Confirm year and engine before ordering—2024+ rails are not interchangeable with 2017–2023 L5P rails.