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Home >> Pontiac >> 1989 >> Firebird Formula, 5.7 8 >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Injection System - 2.8L/3.1L PFI >> Operation >> Fuel Delivery System

Fuel Delivery System

Fuel delivery system utilizes an in-tank electric fuel pump. Pump is integral with gauge sending unit. Fuel is pumped to the fuel rail through an in-line fuel filter. Fuel pump provides fuel at a pressure and volume exceeding engine requirements. Pressure regulator, mounted on the fuel rail, maintains a proper constant fuel pressure to the injectors. Pressure regulator increases the fuel pressure when engine vacuum decreases. Excess fuel is returned to the fuel tank through pressure regulator, using a fuel return line.

Fig 1: Typical Port Fuel Injection System
G3250Courtesy of GENERAL MOTORS CORP.