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Author Topic: Fuel tant air pressure  (Read 773 times)

mj1sjc

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Fuel tant air pressure
« on: May 07, 2021, 08:18:52 PM »
Is it okay to let the air pressure release by opening the fuel cap at random times or just do it only when refuelling?

Is there any pluses or minuses  to the fuel economy either case? Tia!
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Jocko

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Re: Fuel tant air pressure
« Reply #1 on: May 07, 2021, 08:58:42 PM »
I never open my fuel filler cap unless I am refilling the tank. I always get a good "whoosh". Currently getting 59 mpg.
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embee

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Re: Fuel tant air pressure
« Reply #2 on: May 07, 2021, 10:01:48 PM »
There is no reason to release the pressure in the fuel tank. It will be engineered to run like that for various reasons.
(It's not air, it's fuel vapour).
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Westy36

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Re: Fuel tant air pressure
« Reply #3 on: May 08, 2021, 11:39:03 AM »
yeah, I've always wondered about the woosh. First car I recall doing it.
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Jocko

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Re: Fuel tant air pressure
« Reply #4 on: May 08, 2021, 01:06:41 PM »
All my recent cars have done it.
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JonnyJazz

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Re: Fuel tant air pressure
« Reply #5 on: May 09, 2021, 12:52:59 PM »
It is quite normal. don't worry about it.
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