How to test Fuel Pressure and replace Fuel Pump on Acura Car models?

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The procedure is as follows :----

Fuel Pump

REMOVAL & INSTALLATION

CAUTION

Observe all applicable safety precautions when working around fuel. Whenever servicing the fuel system, always work in a well ventilated area. Do not allow fuel spray or vapors to come in contact with a spark or open flame. Keep a dry chemical fire extinguisher near the work area. Always keep fuel in a container specifically designed for fuel storage; also, always properly seal fuel containers to avoid the possibility of fire or explosion.

CAUTION

The fuel injection system remains under pressure, even after the engine has been turned OFF. The fuel system pressure MUST BE relieved before disconnecting any fuel lines. Failure to do so may result in fire and/or personal injury.See Figure 1

Integra and Legend Coupe

Fig. Fig. 1: Exploded view of an Acura fuel pump assembly

1. Disconnect the negative battery cable.
2. Relieve the fuel pressure, as outlined earlier in this section.
3. Open the fuel tank filler cap to vent off pressure in the tank.
4. Remove the rear seat.
5. Remove the access panel.
6. Unplug the electrical connector from the fuel pump.

WARNING

Ensure that the battery is disconnected before any wires are removed.

7. Remove the fuel pump mounting nuts, then remove the fuel pump from the tank.
8. Installation is the reverse of the removal procedure.

CL, TL, and Vigor

1. Disconnect the negative battery cable.
2. Relieve the fuel pressure, as outlined earlier in this section.
3. Open the fuel tank filler cap to vent off pressure in the tank.
4. Remove the fuel tank, as outlined later in this section.
5. Detach the electrical connector from the fuel pump.

WARNING

Ensure that the battery is disconnected before any wires are removed.

6. Remove the fuel pump mounting nuts, then remove the fuel pump from the tank.
7. Installation is the reverse of the removal procedure.

RL

1. Disconnect the negative battery cable.
2. Relieve the fuel pressure, as outlined earlier in this section.
3. Open the fuel tank filler cap to vent off pressure in the tank.
4. Remove the rear seat cushion.
5. Remove the rear access panel from the floor.
6. Detach the connector from the fuel pump.

WARNING

Ensure that the battery is disconnected before any wires are removed.

7. Remove the fuel pump mounting nuts, then remove the fuel pump from the tank.
8. Installation is the reverse of the removal procedure.

Testing The Fuel Pump

If you suspect a problem with the fuel pump, listen to the pump during the first five seconds after the ignition key is turned to the "ON" position. You should hear the fuel pump motor running.

Integra

1. Remove the rear seat.
2. Remove the access panel.
3. Detach the fuel pump 2-prong connector.

WARNING

Be sure the ignition switch is OFF before removing the wires.

4. Connect the No. 4 terminal and No. 5 terminal, using a jumper wire.
5. Battery voltage must be present at terminal number two when the ignition isON .
6. If the battery voltage is present, check the fuel pump ground.
7. If the ground is OK check the fuel pump.
8. If battery voltage is not present, check the wiring harness.
9. If all wiring checks out, you must next test the fuel pressure, as outlined later in this section.

2.2L, 2.3L 3.0CL & 2.5TL

1. Remove the trunk floor.
2. Remove the access panel.
3. Unplug the fuel pump 3-prong connector.

WARNING

Be sure the ignition switch is OFF before removing the wires.

4. Connect the No. 4 terminal and No.5 terminal using a jumper wire.
5. For the 2.2L, 2.3L 3.0CL, battery voltage must be present at terminal number one when the ignition is ON .
6. For the 2.2L, 2.3L 3.0CL, battery voltage must be present at terminal number three when the ignition is ON .
7. If the battery voltage is present, check the fuel pumps ground.
8. If the ground is OK, check the fuel pump.
9. If battery voltage is not present, check the wiring harness.
10. If all wiring checks out, you must next test the fuel pressure, as outlined later in this section.

3.2TL 3.5RL

1. On the 3.2TL, remove the trunk floor.
2. On the 3.5RL, remove the rear seat.
3. Remove the access panel.

WARNING

Be sure the ignition switch is OFF before removing the wires.

4. Remove the wires from the PGM-FI main relay connector.
5. Connect the No. 2 terminal and No. 5 terminal using a jumper wire.
6. On the 3.2TL, battery voltage must be present at terminal number three when the ignition is ON .
7. On the 3.5RL, battery voltage must be present at terminal number seven when the ignition is ON .
8. If the battery voltage is present, check the fuel pump ground.
9. If the ground is OK, check the fuel pump.
10. If battery voltage is not present, check the wiring harness.
11. If all wiring checks out, you must next test the fuel pressure, as outlined later in this section.

Legend & Vigor

1. On the Legend, remove the rear seat.
2. On the Vigor, remove the trunk floor.
3. Remove the access panel.

Be sure the ignition switch is OFF before removing the wires.

4. Remove the wires from the PGM-FI main relay connector.
5. Connect the No. 5 terminal and No. 7 terminal using a jumper wire.
6. Battery voltage must be present at the fuel pump connector, when the ignition is "ON".
7. If the battery voltage is present, check the fuel pumps ground.
8. If the ground is OK, check the fuel pump.
9. If battery voltage is not present, check the wiring harness.
10. If all wiring checks out, you must next test the fuel pressure, as outlined later in this section.

FUEL PRESSURE TESTING

1. Relieve the fuel filler cap.
2. Remove the service bolt from the fuel filter.

See Figures 2 and 3

Fig. Fig. 2: Loosen the service bolt ...

Fig. Fig. 3: ... then remove the service bolt from the fuel filter

3. Install a fuel pressure gauge.
4. Start the engine and measure the fuel pressure with the engine idling and the fuel pressure regulator vacuum line pinched off.
5. If the engine wont start, turn on the ignition switch ON , wait two seconds, then turn off the ignition switch OFF . Turn the ignition switch back ON again and read the fuel pressure.
6. The acceptable fuel pressure is 43.4-50.5 psi (299-348 kPa).
7. Reconnect the vacuum hose to the pressure regulator.
8. The fuel pressure should be 34.8-41.9 psi (240-289 kPa).
9. If the fuel pressure is higher than normal, inspect the fuel return hose for a clog or pinched area. Also check for a faulty fuel pressure regulator.
10. If the fuel pressure is lower than normal, inspect the system for a clogged fuel filter, faulty pressure regulator, or fuel line leakage.

See Figure 4

Fig. Fig. 4: Checking fuel pressure with a gauge

Once the test is complete, perform the following:

1. Remove the fuel pressure gauge.
2. Install the service port bolt and tighten to 25 ft. lbs. (33 Nm).
3. Install the fuel filler cap.

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This details will help.

Thanks.

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