Air coming from fual tank

Mac_daddy · Post by **Mac_daddy** » Mon Jan 01, 2007 5:37 pm

Hiya.. The crazyiest thing keeps happening to me when im opening my fual cap to put petrol in. Every one knows the feeling when opening a well fizzy bottle you can feel the air wanting to come out when you take the lid off, well this is similar to what happens wen i take my petrol cap off. At first i didnt think any thing of it but now it happens very regualar now. Im well shook to open it sometimes in case it blows up on me. Anyone got an idea what this can be???

Ian_R · Post by **Ian_R** » Mon Jan 01, 2007 5:45 pm

its just pressure mate, aint gonna blow up on you lol, i get it from time to time, if i've been driving for a while and round lots of bends, if you really are that worried take it to a garage,

polo power · Post by **polo power** » Mon Jan 01, 2007 6:35 pm

ye its just the pressure after you have been running the fuel low.

olop_chris · Post by **olop_chris** » Mon Jan 01, 2007 6:45 pm

The suzuki i use for work has a warning sticker, stating that you must open the fuel cap slowly due to the pressure...must be a normal thing, though it never happens in my polo.

JWC · Post by **JWC** » Tue Jan 02, 2007 9:27 am

It should not be doing that, there is a breather to the charcoal canister. It would seem that its not opening, or its become blocked.

I had a tank implode when that happened.

It also happened on a Cessna 150, and because the tank was integral to the wing, it caused the wing to fold up. Ouch.

Dee-vub · Post by **Dee-vub** » Tue Jan 02, 2007 1:53 pm

JWC wrote:It should not be doing that, there is a breather to the charcoal canister. It would seem that its not opening, or its become blocked.

I had a tank implode when that happened.

It also happened on a Cessna 150, and because the tank was integral to the wing, it caused the wing to fold up. Ouch.

omicron · Post by **omicron** » Tue Jan 02, 2007 2:54 pm

Firstly - Calm down lads the wings aren't going to fall off anyone's polo any thime soon

Lots of modern cars do this, it's just the fuel return building up a little pressure in the tank, and in all honesty, it's next to none at all, and gradually disperses through the tank breather.

i_am_ray · Post by **i_am_ray** » Tue Jan 02, 2007 3:30 pm

omicron wrote:Firstly - Calm down lads the wings aren't going to fall off anyone's polo any thime soon

LOL!!!!!

JWC · Post by **JWC** » Tue Jan 02, 2007 3:44 pm

depends what your wing is stuck on with

There should not be any residual pressure or vacuum in the system. True you would get a vacuum as the engine uses the fuel, but you do not because it should come in through a breather via the charcoal canister. If there is a vacuum then its not comming in.

Best to work out why before it gets worse and you suffer fuel starvation issues, or crappy economy.

Mac_daddy · Post by **Mac_daddy** » Tue Jan 02, 2007 6:12 pm

JWC wrote: the tank was integral to the wing, it caused the wing to fold up. Ouch.

Lots of mixed views on this one, the problem it self dosen't happen all the time, just now and then. But if it starts to become a regular thing i will bring it to my local Vw to see what they say, as the car is under warrantie. I really hope is hasn't got a fauling problem thats building up

bobtknob · Post by **bobtknob** » Tue Jan 02, 2007 6:19 pm

if you think its a problem i would take it to the dealer anyway
they will either diagnose a problem or tell you not to worry especially if it has a warranty

polo power · Post by **polo power** » Thu Jan 04, 2007 9:56 pm

thats just normal