Suzuki Wagon R Manual page 1286

6E1-4 ENGINE AND EMISSION CONTROL SYSTEM
AIR AND FUEL DELIVERY SYSTEM
The main components of this system are fuel tank,
fuel pump (with built-in fuel filter), throttle body (in-
cluding fuel injector, fuel pressure regulator and idle
speed control actuator), fuel feed line, fuel return line
and air cleaner.
The fuel in the fuel tank is pumped up by the fuel
pump, filtered by the fuel filter and fed under pressure
to injector installed in throttle body. As the fuel pres-
sure applied to the fuel injector (the fuel pressure in
the fuel feed line) is always kept a certain amount
higher than the pressure in the intake manifold by the
fuel pressure regulator, the fuel is injected into the
throttle body in conic dispersion when the injector
opens according to the injection signal from ECM.
The fuel relieved by the fuel pressure regulator re-
turns through the fuel return line to the fuel tank.
The injected fuel is mixed with the air which has been
filtered through the air cleaner in the throttle body. The
air/fuel mixture is drawn through clearance between
throttle valve and bore.
Then the intake manifold distributes the air/fuel mix-
ture to each combustion chamber.
For the structure and operation of the fuel tank and fil-
ter, refer to SECTION 6C "ENGINE FUEL".
1. Air cleaner
2. Throttle body
3. Fuel injector
4. Fuel pressure regulator
5. Intake manifold
6. Air chamber case
7. Fuel tank
8. Fuel pump with filter
9. Fuel feed line
10. Fuel return line
11. Air
12. Fuel
13. Air/fuel mixture