Pressurised fuel tank? - Civinfo
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post #1 of 13 (permalink) Old 7th November 2018, 23:13 Thread Starter
 
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Pressurised fuel tank?

When I unscrew the filler cap there's a hissing sound which is either caused by a vacuum in the tank (and the air is rushing in) or pressure in the tank (air is rushing out). I can't tell which it is.

Is this normal or do I have a blocked breather somewhere?

The car is performing perfectly, but I don't want to strain the fuel pump.

Anyone else have this?
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post #2 of 13 (permalink) Old 8th November 2018, 08:54
 
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I get this every time I go to fuel up lol think it's normal. .

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post #3 of 13 (permalink) Old 8th November 2018, 09:06
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It's normal
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post #4 of 13 (permalink) Old 8th November 2018, 09:59
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I thought that all cars did that when you open the filler cap. Every one of mine has.
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post #5 of 13 (permalink) Old 8th November 2018, 16:50
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Tanks these days are plastic, therefore Flex outwards when filled up with a liquid.. as this is consumed and you release the pressure, the hissing is the tank popping out a lil effectively, thus a small release of pressure.. I think.
Mine has the hapless system ans does it when i put the nozzle into the tank apature..

Normals me thinks, nothing to be worried about.
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post #6 of 13 (permalink) Old 8th November 2018, 17:47
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It's actually the air rushing into the tank from the less than atmospheric pressure created by the fuel pump in the tank. This is so to release LESS hydrocarbons into the atmosphere.
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post #7 of 13 (permalink) Old 8th November 2018, 18:24
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Mine has the hapless system.
As bad as that
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post #8 of 13 (permalink) Old 8th November 2018, 21:20
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If only I could spell.. capless
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post #9 of 13 (permalink) Old 11th November 2018, 02:09 Thread Starter
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Cheers guys
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post #10 of 13 (permalink) Old 21st January 2019, 04:58
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It's a vaccum. Air tight tank, as petrol is pumped out, you get low pressure that's then released when you open the cap. As others have said, it's air rushing in rather than out. Probably done for environmental and safety reasons. A tank full of petrol can become pressurised on a hot day due to the vaporisation. If you naturally have a vacuum in there from usage, it gives more capacity and results in less pressure. Tanks didn't used to be like this but then again they were probably heavier and thicker than the tanks of today. So probably, environment, safety, construction cost.
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post #11 of 13 (permalink) Old 21st January 2019, 10:23
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Mine is also capless so don't get around to the filler to notice if it happens or not? Always noticed it in other cars I've owned though.
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post #12 of 13 (permalink) Old 21st January 2019, 10:50
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My capless hisses when I shove the nozzle in.(no double entendre intended)
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post #13 of 13 (permalink) Old 21st January 2019, 10:55
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My capless hisses when I shove the nozzle in.(no double entendre intended)
Hard to reply to that one
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  Civinfo > 8th Generation Euro Honda Civic (2006 - 2011) > 2009 Civic (8G)

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