Petrol Vapour Escaping

Petrol Vapour Escaping

Author
Discussion

TimmerTVR

Original Poster:

387 posts

222 months

Wednesday 29th November 2006
quotequote all
I posted this on the general gassing forum but havent had many responses and im still unsure as what to do.

On sunday i parked my car after the PH run and noticed in my wing mirror a haze coming from the petrol cap. I took the petrol cap off and noticed a small hole under the filler point.

Is this a major problem? Can i just fill the hole? Or might there be more internal damage to the fuel piping.

If its just a case of filling it should i use body filler or weld it?

One thought i did have is that there are petrol vapours escaping, therefore if i fill the hole will this cause a dangerous pressure build up?







Any thoughts are welcome!!

steve_d

13,796 posts

265 months

Wednesday 29th November 2006
quotequote all
Can't quite see what is going on there.
Is that a rusty hole in steel?
Where does the hole go too?

If it goes through into the filler neck then I would seal it with polysulphide sealant. The stuff used to seal car body panels. It needs to be sealed as water will collect there and make its way into the tank.

If it just goes to the underside of the wing/wheel arch then I would leave it alone.

The petrol vapour would have been there anyway as the tank has to vent. You probably just haven't spotted it before.

Steve

TimmerTVR

Original Poster:

387 posts

222 months

Wednesday 29th November 2006
quotequote all
I'll take a closer look at the hole tommorow, i am hoping thats its nothing and like you said ive just never noticed it before.

Cheers

simes205

4,660 posts

235 months

Wednesday 29th November 2006
quotequote all
I noticed this for years on mine - normally happens in hotter weather.

Nurburgring

162 posts

216 months

Thursday 30th November 2006
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I believe the actual filler neck and tank are plastic on all 205s and so there shouldn't be any rust through the actual pipes. I'll check on mine tomorrow and see where exactly the breather pipe exits, as that little hole could be it. I'll get back to you thumbup

simes205 said:
I noticed this for years on mine - normally happens in hotter weather.


Its probably time to worry (or run) when it stops doing this in warm temperatures as there may be a build up of pressure occurring!

Edited by Nurburgring on Thursday 30th November 00:40

Rob_the_Sparky

1,000 posts

245 months

Thursday 30th November 2006
quotequote all
Odd looking thing you have attached to your filler cap. Never seen one like that before, at a guess it is some sort of restrictor to prevent the use of non-unleaded pumps.

Pretty sure there is a hole there on my cars though, figured it was to prevent a small pond of water forming under the cap but have never bothered to check it out.

Rob

Edited by Rob_the_Sparky on Thursday 30th November 10:31

Nurburgring

162 posts

216 months

Thursday 30th November 2006
quotequote all
Just checked, i've got that little hole but its a slightly different shape.



There are also ones inside the filler. So, its normal



Hope those help!

Edited by Nurburgring on Thursday 30th November 11:31

TimmerTVR

Original Poster:

387 posts

222 months

Thursday 30th November 2006
quotequote all
Rob_the_Sparky said:
Odd looking thing you have attached to your filler cap. Never seen one like that before, at a guess it is some sort of restrictor to prevent the use of non-unleaded pumps.

Pretty sure there is a hole there on my cars though, figured it was to prevent a small pond of water forming under the cap but have never bothered to check it out.

Rob

Edited by Rob_the_Sparky on Thursday 30th November 10:31


Yer the filler system and cap is a plain add on one put on by the previous owner. When i have the money i'll put a propper GTI one on.

megamaniac

1,060 posts

223 months

Thursday 30th November 2006
quotequote all
Surely if it was a manufacturers hole it would be uniform in shape? Bx's used to corrode like this, i would use some tank repair putty or petro patch and fill it in .Venting on the side of the car as it is must be a huge fire hazard.

TimmerTVR

Original Poster:

387 posts

222 months

Thursday 30th November 2006
quotequote all
I now feel very boxedin and banghead.

Haha all i can say is that i saw the hole and the pertol vapour and being a broke student autamatically thought how much? and how to fix it?.

Cheers for all your help and cheers Jamie for taking the time out to take some pics.


Edited by TimmerTVR on Thursday 30th November 14:03

TimmerTVR

Original Poster:

387 posts

222 months

Thursday 30th November 2006
quotequote all
megamaniac said:
Surely if it was a manufacturers hole it would be uniform in shape? Bx's used to corrode like this, i would use some tank repair putty or petro patch and fill it in .Venting on the side of the car as it is must be a huge fire hazard.


Hmm a different view on the problem, maybe they need filling after all?!

Rob_the_Sparky

1,000 posts

245 months

Thursday 30th November 2006
quotequote all
Nope, mine both look like the photos...

combemarshal

2,030 posts

233 months

Friday 1st December 2006
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No, don't fill it, as said you filler pipe is plastic, which, unless they've changed something since I did Science, doesn't rust!
It is there to let water out, I would be inclined to drill a fresh whole slightly bigger where it is (Don't do it with the cap off or it could go BANG!) and then treat it with some red oxide or other rust preventer.
The whole in the filler neck isn't a whole it is a pipe that lets air escape so when your filling you don't end up wearing highly combustible trousers!!

TimmerTVR

Original Poster:

387 posts

222 months

Friday 1st December 2006
quotequote all
Ah good stuff, just me being paranoid again then!

Cheers

dain bramaged

375 posts

219 months

Tuesday 5th December 2006
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i think its just part of the base of the fuel neck that screws to the other side of the panel and not the fuel neck its self, what you should do is shine a bright light down the filler neck and see if you can see light through the hole if you can buy a second hand one and get it fitted not worth repairing only three screws at the cap end and a clip at the bottom hold it in place as for vapour coming from the cap area its self you prob need new cap seal or cap