Fuel Pressure Regulator: Description and Operation

PURPOSE/OPERATION
The Fuel Pressure Regulator maintains a constant fuel pressure to the Fuel Injectors. When the difference between the fuel pressure and Manifold pressure exceeds 3.0 kgf/cm2 (294 kPa, 43 psi), the Diaphragm is pushed upward, and the excess fuel is fed back into the Fuel Tank through the Return Line.