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Fuel pump running with truck off

Discussion in '2nd Gen. Tacomas (2005-2015)' started by 85GT 79FJ40, Jan 17, 2011.

  1. Jan 17, 2011 at 8:55 AM
    #1
    85GT 79FJ40

    85GT 79FJ40 [OP] Well-Known Member

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    Last night I went to check that my garage door was shut and I heard a humming sound. So I turn the lights on and put on some shoes and sure enough the fuel pump is running in my 05 tacoma. My wife had driven it that day so I thought maybe she forgot to shut the ignition off. Nope, ignition was off. So I turned it on, then off again and it stopped. Started it and it fired up perfectly fine, and when I shut it off it was silent. So I'm thinking it's time to swap out the fuel pump relay. Anyone else experience this?
     
  2. Dec 22, 2013 at 9:19 PM
    #2
    Jls1147

    Jls1147 New Member

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    Check owners manual. Should be a section around page 25 that is titled for your information. I had this same scare and checked manual first. Approximately 5 hours after engine shut off, you may hear a sound coming from under the truck for several minutes. This is the sound of the fuel evaporation leakage check. It is not the fuel pump but sounds very similar. Hope this helps.
     
    Too Stroked, 14TACO4X4 and tomwil like this.
  3. Dec 22, 2013 at 9:22 PM
    #3
    Justus

    Justus fucks not given

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    Nabisco the kid
    In ur toolbox
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    stockish
    Perfectly normal.


    Some of us have the intercooler pump spin on too.... Its annoying at first, but perfectly normal, dont blame the wifey please.... Unless u got a comfy couch and WiFi.
     
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  4. Dec 22, 2013 at 10:22 PM
    #4
    TxFireman

    TxFireman Factory Pilot

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    Actually, it's a normal pressure test. It's pressurizes the system when the truck is off, and checks for leaks etc. Nothing to do here but let it do it's thing. I believe the trucks temp have to be completely cooled down when it does it, which is why it's often late at night. There is nothing that needs replacing. By starting it, you interrupted the process, so it will just pick another time to check it.
     
  5. Dec 23, 2013 at 2:17 AM
    #5
    Jimmyh

    Jimmyh Well-Known Member

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    OP Date = 01-17-2011, 08:55 AM
     
  6. Dec 23, 2013 at 11:25 AM
    #6
    landphil

    landphil Wishin' I was Fishin'

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    Almost 3 years, wonder if OP is outa the doghouse for conspiring to blame the wifey yet?
     
  7. Dec 20, 2014 at 7:27 PM
    #7
    rwhisen

    rwhisen Member

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    Was in the garage tonight and heard my 2015 doing this, very strange.
     
  8. Dec 20, 2014 at 7:31 PM
    #8
    OZ-T

    OZ-T You chose ... poorly

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    Still normal
     
  9. Nov 8, 2015 at 2:46 PM
    #9
    Ricks2013

    Ricks2013 Well-Known Member

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    A few things
    This same thing just happened to me yesterday. Was cleaning the wheels and all of a sudden I heard a humming/motor noise coming from something on the back of the gas tank. Glad everything is ok.
     
    scottalot likes this.
  10. Nov 8, 2015 at 4:34 PM
    #10
    Climberclimb

    Climberclimb Active Member

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    Haha. I was just about to post about the exact same thing!!! TacomaWorld rocks!!!!!!!
    Cheers
     
    Ricks2013 and scottalot like this.
  11. Nov 8, 2015 at 7:40 PM
    #11
    addicus24

    addicus24 Well-Known Member

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    Some women have a damn long memory.
     
  12. Nov 22, 2015 at 11:40 PM
    #12
    Ericor

    Ericor Member

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    2016 does this as well. Good to know that it's normal. Was about 5 hours after driving.
     
  13. Oct 20, 2016 at 8:58 PM
    #13
    b-real

    b-real Member

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    caught my 15 doing it...climber is right its rad to be able to get answers from fellow taco heads
     
  14. Oct 21, 2016 at 9:18 AM
    #14
    Lester Lugnut

    Lester Lugnut Well-Known Member

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    From the 2015 Tacoma owners manual. Likely applies to many if not all 2nd Gen Tacoma's:

    Noise from under vehicle after turning off the engine

    Approximately five hours after the engine is turned off, you may hear sound
    coming from under the vehicle for several minutes. This is the sound of a fuel
    evaporation leakage check and, it does not indicate a malfunction.
     
  15. Feb 17, 2017 at 4:31 AM
    #15
    smikels

    smikels Well-Known Member

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    Hmm My 2017 was doing this last evening. The thing is it seemed to be doing this for quite a while. I could have swore I heard something when I turned truck off say around 5:30 pm. I came back in garage around 9:00 pm and heard it for sure this time. I went and cranked the truck and turned it off and it stopped. This is so weird. If I hear it again I am going to have to see how long this goes on for.
     
  16. Feb 17, 2017 at 5:01 AM
    #16
    Lester Lugnut

    Lester Lugnut Well-Known Member

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    I would not hesitate to get this 2017 truck into a dealer for warranty service.
     
  17. Feb 17, 2017 at 5:08 AM
    #17
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    5100's all on fours
    [​IMG]
     
  18. Feb 17, 2017 at 5:09 AM
    #18
    Lester Lugnut

    Lester Lugnut Well-Known Member

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  19. Feb 17, 2017 at 5:10 AM
    #19
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    5100's all on fours
    It's a normal function of the truck.
     
  20. Feb 17, 2017 at 5:13 AM
    #20
    Lester Lugnut

    Lester Lugnut Well-Known Member

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    Maybe the 2017s do it and my 2015 doesn't. I've spend a lot of time around my truck and have never noticed this. Over on the t4r(4runner) forum there's talk about an emissions device back in the vicinity of the fuel tank that wakes up so many hours after the engine has been off. Perhaps he is hearing this.
     
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