Fuel Pressure Pulsation Damper: Description and Operation

Fuel Pump And Sender (Typical):

The fuel pulse dampener (#3) is installed between the fuel pump and the fuel sender. It is used to dampen fuel pulsation and reduce noise generated by the fuel pump. A noisy fuel pump could be an indication of an internally ruptured pulsator. When replacing, verify that you are installing the most recent part update.