Question about Acura TL

2 Answers

Buzzing fuel pump

I have a '99 TL and the fuel pump will buzz when the vehicle is turned off. Any answers? Thx.

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  • ecolando Jun 16, 2009

    It only does it at or below a half a tank of gas? I don't believe it is coincidental.

  • ecolando Jun 16, 2009

    The buzzing will be consistent for some time and stop out of nowhere. There is no sound or vibration at all above the 1/2 tank. I have paid attention. I just replaced the ignition switch thinking that maybe the car was thinking the key was in and trying to start. It didn't cure the problem. Thx.

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For More Info Witch INCLUDES Figure Pictures,and More Test Procedures.

ALSO PLEASE Respond and we Can Get this Taken Care of this Problem !


YOU should FIRST Locate and Remove the FUSE marked "FUEL PUMP this is #1 Fuse under the DASH ,FUEL, or FUEL RELAY. With this Fuse removed Do you hear the BUZZzzz Still ? If Not The RELAY is Probably STICKING Closed= > ON thus Buzzing Fuel Pump
RELAY Circuit Troubleshooting

  1. Turn the ignition switch OFF.
  2. Disconnect the PGM-FI main relay 7P connector.
  3. Check for continuity between body ground and PGM-FI main relay 7P connector terminal No.3. Is there continuity? YES - Go to step 4. NO - Repair open in the wire between the PGM-FI main relay and G1O1.
  4. Measure voltage between body ground and PGM-FI main relay 7P connector terminal No.7. Is there battery voltage? YES - Go to step 6. NO - Go to step 5.
  5. Check for a blown ACG S (15A) fuse in the under-hood fuse/relay box. Is the fuse blown? YES - Repair the short in the wire between the PGM-FI main relay and the ACG S (15A) fuse. NO - Repair the open in the wire between the PGM-FI main relay and the ACG S (15A) fuse.
  6. Turn the ignition switch ON (II).
  7. Measure voltage between body ground and PGM-FI main relay 7P connector terminal No.5. Is there battery voltage? YES - Go to step 9. NO - Go to step 8.
  8. Check for a blown No.1 FUEL PUMP (15A) fuse in the driver's under-dash fuse/relay box. Is the fuse blown? YES - Repair the short in the wire between the PGM-FI main relay and the No.1 FUEL PUMP (15A) fuse. NO - Repair the open in the wire between the PGM-FI main relay and the No.1 FUEL PUMP (15A) fuse.
  9. Shift to Park, then turn the ignition switch to the START (III) position, and measure voltage between body ground and PGM-FI main relay 7P connector terminal No.2. Is there battery voltage? YES - Go to step 11. NO - Go to step 10.
  10. Check for a blown No.13 STARTER SIGNAL (7.5A) fuse in the driver's under-dash fuse/relay box. Is the fuse blown? YES - Repair the short in the wire between the PGM-FI main relay and the No.13 STARTER SIGNAL (7.5A) fuse. NO - Repair the open in the wire between the PGM-FI main relay and the No.13 STARTER SIGNAL (7.5A) .
  11. Turn the ignition switch OFF.
  12. Disconnect the PCM connector A(32P).
  13. Check for continuity between PGM-FI main relay 7P connector terminal No.1 and PCM connector terminal A15. Is there continuity? YES - Go to step 14. NO - Repair open in the wire between the PGM-FI main relay and the PCM (A15).
  14. Reconnect the PCM connector A (32P) and the PGM-FI main relay 7P connector.
  15. Turn the ignition switch ON (II).
  16. Measure voltage between the PCM connector terminals B1 and B2, and between B9 and B2. Is there battery voltage? YES - Go to step 17. NO - Check for an open in the wires between the PGM-FI main relay and the PCM (B1, B9). If the wires are OK, replace the PGM-FI main relay.
  17. Turn the ignition switch OFF, then ON (II) again.
  18. Measure voltage between PCM connector terminals A15 and B2 within the first 2 seconds after the ignition switch is turned ON (II). Is there 1.0 V or less? YES - PGM-FI main relay may be faulty; go to step 19. NO - Substitute a known-good PCM and recheck. If prescribed voltage is now available, replace the original PCM.
  19. Remove the PGM-FI main relay.
  20. Connect battery power to PGM-FI main relay 7P connector terminal No.2 and connect ground to PGM-FI main relay 7P connector terminal No.1. Then check for continuity between PGM-FI main relay 7P connector terminals No.5 and No.4. NOTE: Use the terminal number shown. Ignore the terminal numbers molded into the relay. Is there continuity? YES - Go to step 21. NO - Replace the PGM-FI main relay and reset.
  21. Connect battery power to PGM-FI main relay 7P connector terminal No.5, and connect ground to PGM-FI main relay 7P connector terminal No.3. Then check for continuity between PGM-FI main relay 7P connector terminals No.7 and No.6. Is there continuity? YES - Go to step 22. NO - Replace the PGM-FI main relay and reset.
  22. Connect battery power to PGM-FI main relay 7P connector terminal No.6, and connect ground to PGM-FI main relay 7P connector terminal No.1. Then check for continuity between PGM-FI main relay 7P connector terminals No.5 and No.4. Is there continuity? YES - The PGM-FI main relay is OK. NO - Replace the PGM-FI main relay and retest.

Posted on Jun 17, 2009

  • Ronnie Wilson Jun 17, 2009

    If this Problem is Determined on the Fuel Gauge Reading @ 1/2 or less Level,

    This Shows that the Fuel PUMP itself is Causing it Because It Should NEVER

    Make an Abnormal Noise such as A Buzz And if it ONLY Happens @ a Certain FUEL LEVEL

    Well Fuel Pump Is Suspect to me Here Even if It Were a NEW PUMP, I would Suspect it.

    Would not Surprise me if the Relay May have Sustained Damage from the Malfunctioned FUEL PUMP.

    PLEASE Respond As to the Age of Fuel Pump and any other Info Pertaining to this Condition.

    Thank You For your Patience



    Fuel Pump Replacement Just in Case


    1. Remove the spare tire lid.
    2. Remove the access panel from the floor.
    3. Turn the ignition switch OFF, then disconnect the fuel tank unit 5P connector.
    4. Remove the fuel fill cap.
    5. Relieve fuel pressure.
    6. Disconnect the quick-connect fittings from the fuel tank unit.

    7. Remove the bolts (A), and the fuel pump assembly (B).

    8. Remove the bracket (A), the fuel filter (B), the fuel gauge sending unit (C), the hose (D), and the wire harness (E).
    9. When connecting the fuel pump, make sure the connection is secure and the suction filter (H) is firmly connected to the fuel pump (I).
    10. Install the tank unit in the reverse order of removal with a new base gasket, then check these items:



      • When connecting the wire harness, make sure the connection is secure and the terminal (F) is firmly locked into the place.
      • Check that the tab of the clamp (G) does not interfere with the wire harness.
      • Do not push the lower part of suction filter.
      • When installing the fuel gauge sending unit, make sure the connection is secure and the connector is firmly locked into place. Be careful not to bend or twist it excessively.

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  • Expert
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Sounds like the fuel pump relay is stuck on. find the relay and replace it. hope this helps mike

Posted on Jun 16, 2009

  • michael sinclair
    michael sinclair Jun 16, 2009

    you may only hear it when it is that low. till it hits half a tank the fuel pump is covered be fuel. below a half a tank no fuel to insulate the noise. fill it up and listen carefully to see if you can hear the pump running. hope this helps mike

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