YH4
GRAND
VITARA
1. Fuel tank
2. Fuel pump
3. Fuel filter
4. Fuel feed line
5. Fuel return line
6. Fuel pressure regulator
7. Vacuum hose for fuel
pressure regulator
8. Intake manifold surge tank
9. Fuel injector
10. Fuel delivery pipe
11. Throttle valve
Fuel
Air
ENGINE AND EMISSION CONTROL SYSTEM (H25 ENGINE) 6E2-7
The fuel delivery system consists of the fuel tank, fuel
pump, fuel filter, fuel pressure regulator, delivery pipe
and fuel injectors.
The fuel in the fuel tank is pumped up by the fuel
pump, filtered by the fuel filter and fed under pressure
to each injector through the delivery pipe.
As the fuel pressure applied to the injector (the fuel
pressure in the fuel feed line) is always kept a certain
amount higher than the pressure in the intake man-
ifold by the fuel pressure regulator, the fuel is injected
into the intake port of the cylinder head when the in-
jector opens according to the injection signal from
ECM (PCM).
The fuel relieved by the fuel pressure regulator re-
turns through the fuel return line to the fuel tank.
FUEL DELIVERY SYSTEM
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