Mechanical Returnless Fuel

Fuel is supplied at high pressure to the fuel injectors through a fuel injection supply manifold, also referred to as a fuel rail.

Fuel System - Mechanical Returnless:

6. Located on the fuel rail is a pulse damper. The pulse damper reduces fuel system noise caused by the pulsing of the fuel injectors. The vacuum port located on the damper is connected to manifold vacuum to avoid fuel spillage in the event the pulse damper diaphragm were to rupture (the pulse damper should not be confused with a fuel pressure regulator). Description and Operation