Fuel System: 1G-1
Fuel System
Precautions
Precautions on Fuel System Service
S5JB0A1700001
WARNING
!
Before attempting service of any type on fuel system, the following should be always observed in
order to reduce the risk or fire and personal injury.
• Disconnect negative cable at battery.
• Do not smoke, and place no smoking signs near work area.
• Be sure to have CO
2
fire extinguisher handy.
• Be sure to perform work in a well-ventilated area and away from any open flames (such as gas hot
heater).
• Wear safety glasses.
• To relieve fuel vapor pressure in fuel tank, remove fuel filler cap from fuel filler neck and then
reinstall it.
• As fuel feed line is still under high fuel pressure even after stopping engine, loosening or
disconnecting fuel feed line directly may cause dangerous spout of fuel. Before loosening or
disconnecting fuel feed line, make sure to relieve fuel pressure referring to “Fuel Pressure Relief
Procedure: ”.
• A small amount of fuel may be released when the fuel line is disconnected. In order to reduce the
risk of personal injury, cover a shop cloth to the fitting to be disconnected. Be sure to put that cloth
in an approved container after disconnecting.
• Never run engine with fuel pump relay disconnected when engine and exhaust system are hot.
• Note that fuel hose connection varies with each type of pipe. Be sure to connect and clamp each
hose correctly referring to “Fuel Hose Disconnecting and Reconnecting: ”.
After connecting, make sure that it has no twist or kink.
• When installing injector or fuel feed pipe, lubricate its O-ring with gasoline.
General Description
Fuel System Description
S5JB0A1701001
CAUTION
!
This engine requires the unleaded fuel only.
The leaded and/or low lead fuel can result in
engine damage and reduce the effectiveness
of the emission control system.
The main components of the fuel system are fuel tank,
fuel pump assembly (with fuel filter and fuel level gauge),
fuel pressure regulator, fuel feed line and fuel vapor line.
For the details of fuel flow, refer to “Fuel Delivery System
Diagram: ”.
Fuel Delivery System Description
S5JB0A1701002
The fuel delivery system consists of the fuel tank, fuel
pump assembly (with built-in fuel filter), fuel pressure
regulator, delivery pipe, injectors, fuel return line, fuel
vapor line and fuel feed line.
The fuel in the fuel tank is pumped up by the fuel pump,
sent into delivery pipe and injected by the injectors.
As the fuel pump assembly is equipped with built-in fuel
filter, the fuel is filtered and its pressure is regulated after
being sent to the feed pipe.
The excess fuel at fuel pressure regulation process is
returned back into the fuel tank.
Also, fuel vapor generated in fuel tank is led through the
fuel vapor line into the EVAP canister.
For system diagram, refer to “Fuel Delivery System
Diagram: ”.
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