Fuel Pressure Regulator - Specifications Revised

Group Ref.: 6E - Engine Fuel & Emission

Bulletin No.: 416521

Date: August, 1994

SERVICE MANUAL UPDATE

SUBJECT:
SECTION 6E2 - REVISED FUEL PRESSURE SPECIFICATIONS

MODELS:
1989-94 GEO METRO WITH 1.0L ENGINE (VIN 6 - RPO LP2)

Circuit Description:

When the ignition switch is turned to the "ON" position, the Engine Control Module (ECM) will turn "ON" the in-tank fuel pump. It will remain "ON" as long as the engine is cranking or running and the ECM is receiving ignition reference pulses. It there are no reference pulses, the ECM will shut "OFF" the fuel pump in about 2 seconds after ignition "ON" or engine stops.

The fuel pump delivers fuel through an in-line filter to the TBI assembly. The integral fuel pressure regulator controls system pressure to about 160-210 kPa (23-31 psi) with ignition switch "ON" and to about 90-140 kPa (13-20 psi) with the engine idling at normal operating temperature. Excess fuel is returned to the fuel tank through a separate line.