Sierra 1500 2WD V8-5.3L Hybrid (2004)
Fuel Pressure Regulator: Description and Operation
FUEL PRESSURE REGULATOR ASSEMBLY
The fuel pressure regulator is a vacuum operated diaphragm relief valve. The diaphragm has fuel pressure on one side and regulator spring pressure
and intake manifold vacuum on the other side. The fuel pressure regulator compensates for changes in intake manifold vacuum by changing the fuel
pressure. In this way, the fuel pressure regulator maintains a constant pressure differential across the fuel injectors under all operating conditions.
