With a common-rail injection system, high-pressure fuel is pumped through and stored in a rail that feeds many injectors at once, instead of through a pump that directly feeds an injector.

The high-pressure fuel lines send fuel from the rail to the fuel tubes mounted inside the head. Fuel then enters the injector and then eventually exits through the holes in the injector nozzle holes.

More than 4,400 Cummins Inc. remanufactured engines are being recalled because of a defective fuel rail that could lead to a fire.