S15/T15 2WD P/U V6-262 4.3L VIN Z (1992)
Fuel Pressure Regulator: Description and Operation
PURPOSE
The regulator's function is to maintain a constant fuel pressure drop across the injector at all times.
OPERATION
Fuel pressure is regulated by the difference between fuel pump pressure acting on one side of the diaphragm and the force of the calibrated spring (and
air cleaner air pressure acting on the other side The system operates in an acceptable pressure range of 62 to 90 kPa (9 to 13 psi).
If the fuel pressure is too low (below 62 kPa or 9 psi), poor performance could result. If the pressure Is too high (above 90 kPa or 13 psi), excess
emissions and unpleasant exhaust odor may result.
CONSTRUCTION
The pressure regulator is part of the fuel meter assembly, and contains an air chamber and a fuel chamber that are separated by a diaphragm-operated
relief valve and a calibrated spring.
