anyone had a banging from the rear?

[shnozz]

apologies for the thread title.

I have noticed on several occasions a loud low bang from the petrol tank area of my chim. Almost like a pressure release banging noise. At first I put it down to something in the boot but have had it on occasions when the boot is empty. Was wondering if their is compressed air in the petrol tank??

Anyone else had a similar problem (or quirk )?

[fatsteve]

Yep, it's a well known "feature". You'll also notice that when you take the filler cap off to fill it up (strange that!), there is a whoosh of air.

'tis a bit disturbing the first few times you hear it!!

Steve

[Big Al.]

Petrol filler Cap? loosen it to the half way (notch) position.

See if that stops the banging.

If it dose then it could be that your breather is blocked or kinked (oooer).

[simpo two]

shnozz said:

Was wondering if their is compressed air in the petrol tank??

Opposite - as petrol is used you can get a temporary partial vacuum - then a 'boing' as it equalises.

[cosmoschick]

Big Al. said:

Petrol filler Cap? loosen it to the half way (notch) position. See if that stops the banging.

You're absolutely right Al, I found that did the trick for mine to stop the banging noise

Good job too, cos prior to keeping the cap in the new "loose" position, I remember pulling up at the petrol station one day and the filler cap was so tight I couldn't undo it. Oh that looked soooooo cool...NOT!!! Anyway all was not lost cos a nice young man offered to do it for me...*sigh*

And don't twist what I've just said!! We're talking cars, right

[hongkongfooi]

fatsteve said:

Yep, it's a well known "feature". You'll also notice that when you take the filler cap off to fill it up (strange that!), there is a whoosh of air. 'tis a bit disturbing the first few times you hear it!! Steve

I had this from a very modified M3 and eventually it split the tank......please tell me this will not happen please!!!!!!!!!!!!!!!!!!

[Big Al.]

cosmoschick said:

And don't twist what I've just said!! We're talking cars, right

Right

Roz, you may want to get your Breather checked! you should have the filler done up fully for safety reasons.

Not spillage of petrol if your car is bumped of knocked.

So next time you take it up to Austec, get the lads to check it out, the breather that is. Oh

[N4 SPY]

Big Al. said:

cosmoschick said: And don't twist what I've just said!! We're talking cars, right Right Roz, you may want to get your Breather checked! you should have the filler done up fully for safety reasons. Not spillage of petrol if your car is bumped of knocked. So next time you take it up to Austec, get the lads to check it out, the breather that is. Oh

Hi Big Al,

Where is the breather located? I've just started getting a loud bagging in mine too ...... quite startling???

Cheers

[Big Al.]

I think it's in the front wing! But not really too sure.
Bibles in the car which is under wraps. I'll check later if nobody replies.

[hut49]

I think you're referring to the carbon cannister, through which the petrol tank vents. This link will give you more information - including a link to Steve Heath's Bible - the source of all useful knowledge and the meaning of life.
www.pistonheads.com/gassing/topic.asp?t=18419&f=8&h=0&hw=cannister

[N4 SPY]

hut49 said:

I think you're referring to the carbon cannister, through which the petrol tank vents. This link will give you more information - including a link to Steve Heath's Bible - the source of all useful knowledge and the meaning of life. www.pistonheads.com/gassing/topic.asp?t=18419&f=8&h=0&hw=cannister

Thanks hut49 and Big Al, I'll give that a go.

Cheers

[Big Simp]

Sorry im married mate i dont hear any banging noises anymore in my life,,,,,,,,,,,,