High Pressure Pump Regulator
- Check for pinched or broken vacuum hoses. Connect fuel pressure gauge to service port of fuel filter. Start engine. Check that fuel pressure increases when vacuum hose from regulator is disconnected.
- Fuel pressure should be 33-39 psi (2.35-2.75 kg/cm2 ). If fuel pressure does not increase, pinch return hose slightly 2 or 3 times. If fuel pressure still does not increase, replace pressure regulator.