D:01:06
Fuel,
Emission and Exhaust System
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Primary Pressure
2 Return Fuel
(Pressure Less)
1 Fuel Tank
2 Fuel Pump
3 Accumulator
4 Filter
5 Primary Pressure Regulator
Fig. 4
PRIMARY PRESSURE CIRCUIT
An electric fuel pump (2) runs constantly during
cranking and when the engine is running. It
supplies
*uel
to the lower chambers of the fuel
distributor. Any fuel that is not used, returns to the
fuel tank by passing through the primary pressure
regulator
(5).
The primary pressure regulator controls main line
fuel pressure.
If
the main line pressure increases
above a pre-set value, the pressure forces the
regulator open. This allows fuel to return to the
tank, maintaining a constant main line pressure.
Fig. 4.
1
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