4. Fuel Injection System
4-5
Fuel System Outline
System Description
1. After Key-on, the sensors send signals to the ECU. ECU controls the fuel pump relay, making the fuel
pump operate. If the engine is not started, the fuel pump will be shut down in 2 or 3 seconds in order to
save electricity. The fuel pressure regulator maintains fuel pressure at 294 „ 6kpa (about 3 kg / cm …).
According to the operating conditions and the environmental compensation coefficients, fuel injector
injects appropriate fuel quantity. Key-off or engine stopped operating, the fuel pump stops running.
2. Impurities are filtrated by the fuel filter, which should be regularly replaced.
3. When the engine can not be started, do not start motor for continuous movement which could led to
lack of battery electricity (less than 10 V), the electric fuel pump will not be able to move.
Injector
Two-hole injector provides intake valves with two fuel injection, increasing fuel atomization effect, and
reducing HC emission. The short-type injector cap can easily fix the injector and receives fuel from the
fuel pump, preventing the injector from rotating and sliding. ECU supplies control signals to the fuel
pressure regulator which uses the diaphragm and spring to maintain the fuel pressure at 294 „ 6kpa
(about 3 kg / cm …), and controls the injection quantity by determining the injection time width.
Fuel pump
Electrical fuel pump is mounted inside the fuel tank, powered by the battery and controlled by ECU. Fuel
pressure at idle speed: 294 „ 6kpa (about 3 kg / cm …).
Injector
Fuel pump
Fuel pump
relay
ECU
Battery
Power relay
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