DeVille V8-4.9L VIN B (1995)
Fuel Pressure Regulator: Description and Operation
Fuel Pressure Regulator
The fuel pressure regulator is a diaphragm operated relief valve having fuel pump pressure on one side and regulator spring pressure and intake manifold
vacuum on the other side. The function of the regulator is to maintain a constant fuel pressure at the fuel injectors at all times. The pressure regulator
compensates for engine load by increasing fuel pressure as engine intake manifold vacuum drops. The pressure regulator is mounted on the fuel rail.
If the pressure regulator supplies fuel pressure which is too low or too high, a driveability condition will result.