Fuel Pressure: Testing and Inspection
Fuel Pump Operation Check1. Turn the ignition switch to the OFF position.
Connecting Jumper To Terminal:
2. Apply battery voltage to the fuel pump drive connector to check that the pump operates.
NOTE
- The fuel pump is in-tank type and Its operating sound is hard to hear without removing the fuel tank cap.
3. Pinch the hose to check that fuel pressure is felt.
Fuel Pressure Test
1. Reduce the internal pressure of the fuel pipes and hoses by the following procedures.
Fuel Pump Connector Location:
- Disconnect the fuel pump harness connector in the rear seat side.
- 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. Remove the upper eye bolt while holding the fuel filter nut securely.
CAUTION
- Cover the hose connection with a shop towel to prevent splashing of fuel caused by residual pressure In the fuel line.
Gauge to fuel filter torque: 5 - 35Nm (18 - 25 lb.ft)
3. Using the fuel pressure gauge adapter (09353-24000, 09353- 24100, 09353-24200), install the fuel-pressure gauge to the fuel filter. Tighten the bolt to the specified torque.
4. Connect the battery's negative (-) terminal.
5. Apply battery voltage to the terminal for the pump drive and activate the fuel pump; then, with fuel pressure applied, check that there is no fuel leakage from the pressure gauge or connection part.
Disconnecting Fuel Pressure Regulator Vacuum Hose:
6. Disconnect the vacuum hose from the pressure regulator, and plug the hose end. Measure the fuel pressure at idle.
Standard value:320-347 kPa (3.26-3.47 kg/cm2, 46-49 psi)
7. Measure the fuel pressure when the vacuum hose is connected to the pressure regulator.
Standard value: Approximately. 270 kPa (39psi)
8. If the results of the measurements made in steps (6) and (7) are not within the standard value, use the table next page to determine the probable cause, and make the necessary repairs.
9. Stop the engine and check for a change in the fuel pressure gauge reading, which should hold for approximately 5 minutes. It the gauge indication drops, observe the rate of drop. Determine and remove the causes according to the following table.
10. Reduce the fuel pressure in the fuel line.
11. Disconnect the high pressure hose and remove the fuel pres sure gauge from the delivery pipe.
CAUTION
- Cover the hose connection with a shop towel to prevent splashing of fuel caused by residual pressure in the fuel line.
12. Install a new 0-ring in the groove at the end of the high- pressure hose.
13. Connect the high pressure fuel hose to the fuel filter, and tighten the screws to the specified torque..
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.