Fuel Pressure Regulator

How it works

  • High pressure fuel enters a chamber that has the regulator inlet and outlet.
  • High pressure fuel pushes against the diaphragm in the regulator, and hence acts against spring behind the diaphragm.
  • The vacuum line attached to the nipple also acts against the diaphragm. As engine demand increases, so does the pressure acting on the diaphragm.
  • Under low fuel demand the majority of the pumped fuel is exiting the regulator bypass. The regulator bypass is sending unused fuel back to the fuel tank.
  • As more fuel is needed by the engine, less is sent through the regulator bypass.