Fuel Junction Block

The fuel junction block is located between the left and right fuel rail assemblies. The fuel junction block consists of the following components:
^ Fuel Rail Pressure Sensor
^ Fuel Pressure Relief Valve

The fuel rail pressure sensor gives the ECM an indication of fuel pressure. The ECM uses this information to regulate fuel pressure, by commanding the fuel pressure regulator open or closed on the inlet of the fuel injection pump.

The fuel pressure relief valve opens only to prevent excessive pressure in the event of a malfunction. Fuel from the fuel pressure relief valve is returned to the fuel tank.