P0004 - Fuel Volume Regulator Control Circuit High
A fuel volume regulator can be used to control the volume of fuel that a pump delivers.
The method of fuel volume regulation will vary depending on the type of fuel system fitted to the vehicle
Fault Code Explained
This fault code indicates that the fuel volume regulator circuit signal is either above the normal operating parameter or is at battery Voltage
Due to the number of different types of fuel systems and methods used to control fuel volume, it is recommended to refer to the manufacturers fault finding information for a detailed test plan on diagnosing this fault code.