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Thread: Buzzing from the rear of the car! What it is?

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    Guest Aurox's Avatar
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    Exclamation Buzzing from the rear of the car! What it is?

    Hi everyone, It's years that I occasionally ear this buzzing noise from the rear of the car (with car and keys off), days ago working on it I've found that looks like it's coming from the rear and that if the car's left under the sun or in hot days then the noise will keep for several minutes.
    What could it be? Rear diff oil pump ? or something else ?
    Many thanks

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    Fuel tank

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    Quote Originally Posted by shogun View Post
    Fuel tank
    Really ? So it was the fuel pump ? Is this normal or I've some bad wiring/short circuit somewhere?

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    I expect it's coming from the breather system, I knew of a Vectra that used to moo like a cow on warm days.

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    ^^^This...

    Most likely to be the tank vent struggling to flow air / vapor and making a buzzing / resonant noise.

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    Quote Originally Posted by LongshanksS14 View Post
    ^^^This...

    Most likely to be the tank vent struggling to flow air / vapor and making a buzzing / resonant noise.
    Really ? While working at the rear sway bar under the sun I could easily ear a noise like the fuel pump priming (so lasting around 10s) and once every minute
    Will have a ceck

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    Pull the fuel pump fuse and see if it goes away

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    Undo the petrol cap and see if it goes away.

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    Quote Originally Posted by Jonny Wilkinson View Post
    Undo the petrol cap and see if it goes away.
    This

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