Petrol fumes...

[montegogt]

When I fill right up, I notice petrol fumes when I corner or hit a rough bit of road. Is it the tank breather? Is there a tank breather? Where is the tank breather? Or am I looking at a bigger problem?

[shpub]

For a start which car?

Yes there is. Usually routed behind the carpet in the boot and exits out of the boot floor. I had to fit a one way valve in mine now so that air can get in but fuel doesn't. Could also be a non sealing petrol cap or you have a fuel pipe leak somewhere.

Steve
www.tvrbooks.co.uk

>> Edited by shpub on Tuesday 8th April 09:56

[digga951]

My 350i used to have the same problem and it turned out to be a non-sealing fuel cap. The round piece of rubber in the cap was absent so I made one out of some spare rubber I had and now all is fine. Will also fail the MOT if this isn't present.

[jvaughan]

digga951 said: My 350i used to have the same problem and it turned out to be a non-sealing fuel cap. The round piece of rubber in the cap was absent so I made one out of some spare rubber I had and now all is fine. Will also fail the MOT if this isn't present.

is it an MOT failure ? No one has ever inspected the inside of my fuel cap!

[jmorgan]

Yep a fail if knackered. Have a look here. Handy little site. I assume its up to date legal etc?
www.ukmot.com/manual/6-7.htm

[montegogt]

Steve, it's an '87 350i. I have checked the filler cap seal. There is no leakage from there, so I think the breather sounds like the culprit.
What sort of non-return valve did you use? What was it off?

Lee

[montegogt]

Think some of you are going to the wrong MoT test station...

[shpub]

montegogt said: Steve, it's an '87 350i. I have checked the filler cap seal. There is no leakage from there, so I think the breather sounds like the culprit.
What sort of non-return valve did you use? What was it off?

Lee

Demon Tweeks motor sport one. About £50 IIRC. An alternative that is cheaper is to get some longer tubing and create some loops in it. It may even be that the pipe is split or leaking.

[sevans]

There are a couple of joints between the filler and the tanks which may also be causing the problem. If you fill the tanks right up it's possible for fuel to sit in these joints. May be worth looking at these before you start fitting non-return valves etc.
Regards

[jvaughan]

montegogt said: Think some of you are going to the wrong MoT test station...

I was thinking that ....

[danny hoffman]

Is there supposed to be a rubber seal inside the petrol cap? Mine hasn't got one (looks like a metal sprung one) and yes I do get the odd dribble if I fill right up.

Danny

[gemini]

danny hoffman said
yes I do get the odd dribble if I fill right up.

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Uhm!