Fuel Injection (Fuel System)
FUEL LINE
FU-9
B: PRESSURE REGULATOR
The pressure regulator is installed at the injector end of the fuel supply line. It has a fuel chamber
and spring chamber separated by a diaphragm. Fuel chamber is connected to the fuel supply line
and the spring chamber is connected to the intake manifold. Fuel chamber also has a relief valve
connected to the fuel return line through which fuel returns to the fuel tank. When the intake man-
ifold vacuum increases, the diaphragm is pulled and the relief valve opens to decrease the fuel
supply line pressure (or fuel injection pressure). When the intake manifold vacuum decreases, the
diaphragm is pushed by the spring to increase the fuel supply line pressure. Thus, the difference
between the fuel injection pressure and the intake manifold vacuum is kept at a constant level of
294 kPa (3.00 kgf/cm
2
, 43.0 psi) for MT vehicles or 299.1 kPa (3.05 kgf/cm
2
, 43.4 psi) for AT ve-
hicles to precisely control the amount of injected fuel.
(1) Relief valve A: To intake manifold
(2) Diaphragm B: Fuel IN
C: Fuel OUT
(2)
(1)
A
B
C
S2H0623C
W2290GE_02_FU.fm 9 ページ ２００１年４月１１日 水曜日 午前９時３１分
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