Fuel System Test
WARNING:
Always relieve residual fuel pressure in fuel delivery system before opening system. To prevent chance of personal injury, cover fittings with shop towel while disconnecting fittings.
- Remove cap from pressure test port located in fuel rail. See Fig 1 . Connect Fuel Pressure Gauge (J-34730-1) to pressure fitting.
- Start vehicle. Pressure should be approximately 31 psi (2.1 kg/cm2 ) with vacuum hose connected to pressure regulator and 39 psi (2.6 kg/cm2 ) with vacuum hose removed from pressure regulator.
- Check fuel pump flow rate. A good fuel pump will deliver at least one liter of fuel per minute with fuel return line pinched off. If fuel pump does not pump adequately, inspect fuel system for a plugged fuel filter or filter sock.
- Fuel pump flow rate can be checked by connecting one end of an old A/C gauge hose to fuel test port on fuel rail and inserting other end of hose into a container of at least one liter or more capacity.
- Run fuel pump by installing a jumper wire into diagnostic connector terminals D1-5 and D1-6. Be sure to pinch off fuel return line or most of fuel will be returned to fuel tank.