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Thread: Cap-less Fuel System

  1. #1
    DavidMC's Avatar
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    Default Cap-less Fuel System

    I am happy generally with the cap-less filler. One quick question: for the first few months I owned the car, inserting the filler nozzle, pushing the flap back resulted in a quite satisfying 'hiss'. Presumably vacuum from the fuel drawn from the tank by the pump. As time went on this effect became less frequent and now there is never any vacuum release to be heard.

    Looking at the flap it seems it is actually vented so I have no idea where the seal I was breaking is / was... Anyone else noted this change or has something further down the 'pipe' broken on my car?

  2. #2
    Trev H's Avatar
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    Mine occasionally blows fuel back when I put the fuel nozzle in, but that’s from the nozzle, not the tank. I always assumed that the tank had a slight pressure and not a vacuum?
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  3. #3
    FaNtheMaN's Avatar
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    Yeah you're right David, first few months always a hiss and once or twice I did get covered in fuel - but doesn't happen at all now...

    Literally have no idea!!?
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    allycooke's Avatar
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    I find it's more likely to hiss the lower the fuel level is when I fill up - I guess because there's more air than fuel in the tank.
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  5. #5
    Partyvan's Avatar
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    It'll also depend on the temperature.

  6. #6
    ColdWind666's Avatar
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    Filled up yesterday, was a hot day, and it hissed at me

  7. #7
    DavidMC's Avatar
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    Mine never 'hisses' at all ever. No warnings on dash etc so it's really not an issue.... I just wonder what's going on! ?

    Also I still feel the TA system is crap on these cars ..... (different topic sorry)

  8. #8
    jay.dee's Avatar
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    Incidentally there is a recent US recall on the cap becoming frozen:
    https://static.nhtsa.gov/odi/tsbs/20...P0pTwUZHZxn92M

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