Fuel Pressure Regulator: Testing and Inspection

Inspection
Fuel line pressure

WARNING: Before performing the following operation, release the fuel pressure from the fuel system to reduce the possibility of injury or fire.
Fuel Pressure Release

1. Disconnect the negative battery terminal.





2. Connect a fuel pressure gauge between the high pressure fuel filter and the fuel rail hose. (Install clamps as illustrated in the figure.)
3. Connect the negative battery terminal.
4. Start the engine and run it at idle.
5. Measure the fuel line pressure.

Fuel line pressure: 30-37 psi (206-255 kPa)

6. Disconnect the vacuum hose from the pressure regulator and measure the fuel line pressure.

Fuel line pressure: 38-46 psi (265-314 kPa)

Hold pressure
Conduct this inspection if the fuel pressure hold inspection is not as specified.

WARNING: Before performing the following operation, release the fuel pressure from the fuel system to reduce the possibility of injury or fire.
Fuel Pressure Release

1. Disconnect the negative battery terminal.





2. Connect a fuel pressure gauge between the fuel filter and the fuel rail hose. (Install clamps as illustrated.)
3. Connect the negative battery terminal.





4. Connect the data link connector (DLC) terminals F/P and GND with a jumper wire.
5. Turn the ignition switch ON for 10 seconds to operate the fuel pump.
6. Turn the ignition switch OFF and disconnect the jumper wire.
7. Pinch the fuel return hose with pliers.
8. Observe the fuel pressure for 5 minutes.

Fuel pressure: More than 21 psi (147 kPa)

9. If not as specified, replace the pressure regulator.