Raceworks AN-6 ORB Fuel Pulsation DamperA Fuel Pulsation Damper is used to smoothen the Fuel Pressure and regulate the oscillation of fuel caused by the injectors opening and closing. It uses a diaphragm to absorb pulses in the fuel. They are commonly used in OE appliations, and in performance applications can be useful if fuel pressure isnt stable. This is more common when there isnt rubber hose present in the fuel system, which helps to absorb pulsations, more so than PTFE or Hard Line.