Fuel System

Fuel Supply System

System Description
The fuel supply system consists of a fuel tank, fuel injectors, fuel tank pressure sensor, fuel tank temperature sensor, fuel pressure sensor, fuel temperature sensor, injector control module, fuel injector relay, fuel pressure regulator shut-off solenoid valve, fuel tank internal solenoid valve, fuel pressure regulator, fuel filter and manual shut-off valve.

Manual shut-off valve
This vehicle is equipped with a manual shut-off valve which can cut the fuel supplied to the engine when needed.

Low fuel indicator light
The PCM lights the low fuel indicator light and informs the driver that the fuel level is low.
The PCM calculates the gas quantity in the fuel tank by using the fuel pressure value detected by fuel tank pressure sensor and the fuel temperature value detected by fuel tank temperature sensor, and outputs the signal to the gauge assembly.
When the PCM detects a malfunction of the fuel tank pressure sensor and/or fuel tank temperature sensor, the PCM blinks the low fuel indicator light and causes the fuel gauge to read empty.
When the PCM detects a gas leak, the PCM blinks the low fuel indicator light and reduces the fuel meter to 0. After the engine is stopped while the low fuel indicator light is blinking for a gas leak, the engine will not start until the PCM is reset.







Injector control module
Injector control module controls the fuel injectors, and prevents them from sticking when starting in the extremely low temperatures. Current is increased to the fuel injectors momentarily, when the ignition switch is turned ON (II) to loosen any sticking fuel injectors.




Fuel Pressure Regulator Side:
The pressure relief valve opens when fuel pressure in the fuel pressure regulator rises to more than the regulated value. The gas is discharged outside the vehicle.




Fuel Tank Side:
The pressure relief valve opens when fuel pressure in the fuel tank rises to more than the regulated value. The gas is discharged outside the vehicle to prevent the fuel tank from being damaged.
When fuel tank pressure falls lower than the regulated value, the PCM turns off the fuel tank internal solenoid valve to prevent the tank pressure from continuing to drop (too low a pressure could cause the tank to deform).




Fuel Vent Duct
The fuel lines are enclosed in a duct that will contain any escaped fuel in case there is a leak in the fill pipe. Any leaking fuel is rerouted to the fuel fill compartment to prevent fuel from leaking into the trunk or passenger compartment.




Fuel pressure sensor
The fuel pressure sensor is located on the fuel pressure regulator, and it detects the fuel injector pressure. This signal is used to correct the fuel injection period by monitoring fuel injector pressure. It also detects any abnormality in the fuel pressure.




Fuel temperature sensor
The fuel temperature sensor is located on the fuel rail, and it detects the temperature of the fuel. This signal is used to correct the fuel injection period duration.




Fuel tank pressure sensor
The fuel tank pressure sensor is located on the fuel joint block, and it detects the fuel tank pressure. This signal is used to calculate the amount of fuel in the tank and to detect any gas leakage.




Fuel tank temperature sensor
The fuel tank temperature sensor is located on the fuel joint block, and it detects the temperature of the fuel. This signal is used to calculate the amount of the fuel in the tank.