Fuel Pressure: Testing and Inspection
FUEL PRESSURE TEST1. Reduce the internal pressure of the fuel pipes and hoses by the following procedures.
- Disconnect the fuel pump harness connector under the rear seat.
- Start the engine and, after it stops by itself, turn the ignition switch to the OFF position.
- Disconnect the battery negative (-) terminal. Connect the fuel pump harness connector.
2. Disconnect the fuel high pressure hose at the fuel line side.
CAUTION: Cover the pipe connection with a shop towel to prevent fuel from splashing (caused by residual pressure in the fuel line).
3. Using the fuel pressure gauge adapter (09353-34000), install the fuel-pressure gauge to the fuel high pressure hose.
4. Connect the battery's negative (-) terminal.
5. Apply battery voltage to the fuel pump drive terminal, activate the fuel pump; then, with fuel pressure applied, check that there is no fuel leakage from the pressure gauge or connection pan.
6. Start the engine and let it idle.
Disconnecting Fuel Pressure Regulator Vacuum Hose:
7. Disconnect the vacuum hose from the pressure regulator and plug the hose end. Measure the fuel pressure at idle.
Fuel pressure 320-340 kPa (3.26-3.47 kg/sq.cm,46-49 psi)
8. Measure the fuel pressure when the vacuum hose is connected to the pressure regulator.
Fuel pressure approximately 270 kPa (2.75 kg/sq.cm, 39 psi)
9. If the results of the measurements made in steps (7) and
(8) are not within the standard value, use the table to determine the probable cause, and make the necessary repairs.
10. Stop the engine and check for a change in the fuel pressure gauge reading, which should hold for approximately 5 minutes. If the gauge indication drops, observe the rate of drop. Determine the probable causes and repair them according to the table.
11. Reduce the fuel pressure in the fuel line.
12. Disconnect the high pressure hose and remove the fuel pressure gauge.
CAUTION: Cover the pipe connection with a shop towel to prevent fuel from splashing (caused by residual pressure in the fuel line).
13. Connect the high pressure fuel hose to the fuel line to the specified torque.
Tightening torque 30-40 kPa (300-400 kg/sq.cm, 22-29 psi)
14. Check for fuel leaks.
- Apply battery voltage to the fuel pump drive terminal to operate the fuel pump.
- With pressure, check the fuel line for leaks.