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Can a loose fuel filler cap cause fuel loss?

I did an emissions test and the fuel filler cap was leaking. Can this cause you to lose fuel?

No it can not. The leaking they are referring to with your fuel cap is air leaking out of it. All modern return style fuel systems are pressurized for emissions purposes. A leaking cap will reduce fuel mileage and maybe also cause a check engine light it should also cause an emissions failure. Stop by your local auto parts store and get a new one. Should cost $10. Good luck

This entry was posted on Monday, October 26th, 2009 at 4:22 pm and is filed under fuel emission. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.

7 Responses to “Can a loose fuel filler cap cause fuel loss?”

  1. not really
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  2. Nope, unless you count the vapour.
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  3. When is your period?
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  4. fuel injected turbo?

    yes sahr
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  5. No it can not. The leaking they are referring to with your fuel cap is air leaking out of it. All modern return style fuel systems are pressurized for emissions purposes. A leaking cap will reduce fuel mileage and maybe also cause a check engine light it should also cause an emissions failure. Stop by your local auto parts store and get a new one. Should cost $10. Good luck
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    Autocross racer and mechanic

  6. Yes a small amount through evaporation.
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  7. the mysterious stranger on October 27th, 2009 at 12:13 am

    it sure don,t help preventing the fuel from evaporating.
    and some can run out in the corners and more so just after filling up.
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