17-26 GM 6.6L L5P Duramax GM Fuel Injector Fuel Return Line- Passenger Side

Fits: 2017-2026 GM 6.6L L5P Duramax

Genuine GM fuel system line— specifically a fuel injection return pipe/line assembly used on certain GM diesel vehicles such as the L5P Duramax. It routes excess fuel back from the fuel injectors/rail into the low-pressure side of the system.

• The fuel return line carries residual fuel that isn’t injected back to the tank or low-pressure side of the fuel system.

• It helps maintain proper fuel pressure and circulation through the injectors and fuel rail.

• These return lines are part of the diesel fuel system plumbing often under light pressure (not high-pressure like feed lines).

• If the line is damaged or leaking, it can cause poor idle, elevated fuel odor, or reduced efficiency. 

GM: 12684289