Fuel and Emissions System Description - Fuel Supply System
Fuel and Emissions System Description - Fuel Supply System
Fuel Supply System
The fuel supply system consists of the fuel tank, the injectors, the fuel tank pressure (FTP) sensor, the fuel tank temperature (FTT) sensor, the fuel rail pressure sensor, the fuel temperature sensor, the injector control module, the injector control module relay, fuel shut-off solenoid valve 1, fuel shut-off solenoid valve 2, fuel pressure regulator P1, the fuel pressure switch, the fuel filters, and the manual shut-off valve.
Fuel Cutoff Control
During deceleration with the throttle valve closed, current to the injectors is cut off to improve fuel economy at engine speeds over 800 rpm. Fuel cutoff also occurs when the engine speed exceeds 6,900 rpm, regardless of the position of the throttle valve, to protect the engine from over-revving. When the vehicle is stopped, the PCM cuts the fuel at engine speeds over 5,000 rpm. On the cold engine, fuel cut occurs at a lower engine speed.
Fuel Filter A
The fuel filter prevents contamination in the fuel from getting into the engine.
Fuel Pressure Regulator P1
Fuel pressure regulator P1 lowers the pressure of fuel from the fuel tank and sends it to the injectors.
Fuel filter B prevents contamination from getting into the engine. The fuel pressure switch detects abnormal fuel pressure conditions.
Fuel Pressure Switch
The fuel pressure switch is located on fuel pressure regulator P1. It detects excessive fuel pressure.
Fuel Rail Pressure Sensor
The fuel rail pressure sensor is located on the fuel feed hose joint (near fuel pressure regulator P1) and it detects fuel pressure at the injectors. The signal is used to correct the fuel injection period by monitoring fuel pressure. It also detects any abnormality in the fuel pressure.
Fuel Shut-off Solenoid Valve 1/Fuel Shut-off Solenoid Valve 2
Fuel shut-off solenoid valve 1 is located in the fuel tank. It turns on or off to supply fuel to the engine.
Fuel shut-off solenoid valve 2 is located on fuel pressure regulator P1, and it turns on or off to supply fuel to the engine.
When the ignition switch is turned to ON (II), fuel shut-off solenoid valve 1 and fuel shut-off solenoid valve 2 normally open for 2 seconds.
Fuel tank
Fuel pressure regulator P1
Fuel Tank
The tank is made of aluminum reinforced by carbon fiber and fiberglass. The fuel tank capacity is:
- @3,000 psi: 7.2 gasoline gallons equivalent (GGE)
- @3,600 psi: 8.0 gasoline gallons equivalent (GGE)
Fuel Tank Temperature (FTT) Sensor
The FTT sensor is on the fuel joint block. It measures the temperature of the fuel, and this signal is used to calculate the amount of fuel in the fuel tank.
Fuel Tank Pressure (FTP) Sensor
The FTP sensor is located on the fuel joint block, and it measures fuel tank pressure. The signal is used to calculate the amount of fuel in the fuel tank and to detect any leakage.
Fuel Temperature Sensor
The fuel temperature sensor is on the fuel rail. It measures the temperature of the fuel. Its signal corrects the fuel injection period according to fuel temperature.
Fuel Vent Duct
The fuel lines are enclosed in a duct that contains any escaped fuel in case there is a leak in the fill pipe. The fuel is routed to the fuel fill compartment to prevent it from leaking into the trunk or passenger compartment.
Injector Control Module
The injector control module controls the injectors and prevents them from sticking when starting in extremely low temperatures. When the ignition switch is turned to ON (II), current is momentarily increased to the injectors to loosen any sticking injectors.
Manual Shut-off Valve
The manual shut-off valve is located under floor in the left rear. This valve can be turned manually to cut the fuel supplied to the engine.
Low Fuel Indicator
The low fuel indicator comes on when the fuel level is low. It blinks when a problem is detected with the fuel tank pressure (FTP) sensor, the fuel tank temperature (FTT) sensor, or the fuel pressure regulator switch.
PGM-FI Main Relay 1
PGM-FI main relay 1 is energized whenever the ignition switch is ON (II) to supply battery voltage to the PCM, and power for the injector control module relay and the ETCS control relay.