Sierra 2500 4WD V8-8.1L VIN G (2006)
Fuel Pressure Regulator: Description and Operation
FUEL PRESSURE REGULATOR ASSEMBLY
The fuel pressure regulator is a diaphragm operated relief valve. The fuel pump pressure is on one side of the regulator and the regulator spring pressure
is on the other side. The function of the fuel pressure regulator is to maintain a constant fuel pressure under all of the operating conditions. The pressure
regulator DOES NOT compensate for the engine load by increasing the fuel pressure a s the engine intake manifold vacuum drops. The vent on the fuel
pressure regulator is an atmospheric vent only. The fuel pressure regulator is mounted on the front fuel tank module.
