Fuel Pump Testing
FUEL PUMP (FP)INSPECTION
FUEL PUMP OPERATION CHECK
1. Turn the ignition switch to the OFF position.
2. Apply battery voltage to the fuel pump drive connector to check that the pump operates.
NOTE: The fuel pump is an 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 lines and hoses:
- Disconnect the fuel pump harness connector
- Start the engine and after it stalls, turn the ignition switch to the OFF position
- Disconnect the battery negative (-) terminal
- Connect the fuel pump harness connector
2. Remove the bolt connecting the fuel line to the fuel delivery pipe.
CAUTION: Cover the hose connection with a shop towel to prevent splashing of fuel caused by residual pressure in the fuel line.
3. Install the special service tool (SST)for measuring the fuel pressure.
1. Disconnect the fuel 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.
2. Install the Fuel Pressure Gauge Adapter (09353-38000) between the delivery pipe and the fuel feed hose.
3. Connect the Fuel Pressure Gauge connector (09353-24000) to the Fuel Pressure Gauge Adaptor (09353-38000).
4. Connect the Fuel Pressure Gauge and Hose (09353-24100) to the Fuel Pressure Gauge Connector (09353-24000) to the Fuel Pressure Gauge Connector (09353-24000).
5. Connect the fuel feed hose to the Fuel Pressure Gauge Adaptor (09353-38000).
Fuel presure gauge to fuel delivery pipe: 25 - 35 Nm (250 - 350 kg-cm, 18-26 lb-ft)
4. Connect the battery's negative (-) terminal.
5. Apply battery voltage to the terminal for the pump drive and activate the fuel pump. With fuel pressure applied, check that there is no fuel leakage from the pressure gauge or connection part.
6. Start and run the engine at curb idle speed.
7. Disconnect the vacuum hose from the pressure regulator, and plug the hose end. Measure the fuel pressure at idle.
Standard value : 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.
Standard value : Approx. 255 kPa (2.57 kg/sq.cm, 37 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 at which it drops. Determine and remove the causes according to the table.
11. Reduce the pressure in the fuel line.
12. Disconnect the hose and the gauge.
CAUTION: Cover the hose connection with a shop towel to prevent splashing of fuel caused by fuel residual pressure In the fuel line.
13. Replace the O-ring at the end of the hose.
14. Connect the fuel hose to the delivery pipe and tighten to the specified torque.
15. Check for fuel leakage.
- Apply battery voltage to the fuel pump drive terminal to operate the fuel pump.
- With pressure, check the fuel line for leaks.