Fuel Pressure Regulator
Fuel pressure regulator is located on fuel delivery pipe. Fuel pressure regulator maintains pressure of fuel delivered to injectors at a constant level of 47.6 psi (3.3 kg/cm2 ) on non-turbo engines, or 36.3 psi (2.6 kg/cm2 ) on turbo engines. Regulator is a diaphragm-operated relief valve with pressure applied by intake manifold vacuum. If intake manifold pressure becomes less than fuel pressure, relief valve opens, causing excess fuel to return to fuel tank.