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Strange sounds coming from gas cap

Discussion in '3rd Gen 4Runners (1996-2002)' started by obx4runner, Nov 15, 2020.

  1. Nov 15, 2020 at 3:50 AM
    #1
    obx4runner

    obx4runner [OP] New Member

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    Hi Everyone ! My name is John. I just bought a 2002 Toyota 4Runner limited with 102,000 miles on it. It is great shape and I love the vehicle. I have one question and I am hoping you experts can help. When I open the gas cap after driving the car for say 20min. there is a whooshing of air sound like the system has pulled a vacuum. Also if I don't open the gas cap I hear a burping sound coming from the gas fill area that stops after 30 mins. and the pressure has normalized. Is this normal. I have never experience that in any other vehicle. I am suspecting a venting issue / check valve issue. Any help would be much appreciated.
     
  2. Nov 16, 2020 at 12:23 AM
    #2
    Clutchplate

    Clutchplate New Member

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    Since it's a pressurized system, you will hear air escape when you open gas cap. As for the burping sound, I haven't experienced it. I really don't think you have anything to worry about.
     
  3. Nov 16, 2020 at 2:59 AM
    #3
    obx4runner

    obx4runner [OP] New Member

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    Thanks so much for your reply ! This is new to me so I was a little unsure if this was an issue.
     
  4. Nov 16, 2020 at 8:06 AM
    #4
    negusm

    negusm New Member

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    Yeah, it should Whoosh. That is letting you know your evap system is ok. Unlike mine that never whooshes anymore and every 2 months throws an evap code. Modern cars have a very closed fueling system which tries to capture all vapors from being emitted into the atmosphere.
     
    7385 likes this.
  5. Nov 22, 2020 at 10:11 AM
    #5
    obx4runner

    obx4runner [OP] New Member

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    Thanks everyone...just got a new cap and all is good.
     
    mousemeat and 7385 like this.

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