OK this will sound stupid.
Filled the car up at South West Rocks today, with Shell premium unleaded (thats all that was available). The car now reeks of a rotten egg gas smell. Four other Cooper 's' out of the seven on the trip also filled up at the same place and none of them had the same problem.
Any ideas??

Bini or Mini?

67 MK1 's'

Rotten egg gas is just a by product of combustion - was your car colder than the others as it tends to diedown as the engine comes up to temp

For some reason your car is not burning the fuel as well as the other cars.

Hi Biam

The car was warm when we filled up, and after a 4 hr trip back home was still stinking...you could smell it from a couple of metres away and was rotten inside the car.

Hi Morris

Interesting thing is that filled up with Caltex before we left yesterday and no smell whatsoever until filled up again today

do you have an exhaust leak?

nope

It is just the shell fuel, they use sulphur in there fuels and the smell will go away when you go back to another brand, it effects some cars more than others

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Roundies and Clubbies(except vans) are both ugly that is why I have Midas and a van
1293 Mini Midas Bronze,1275 Clubman van

baked beans or mexican maybe?

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1975 Leyland Mini: 1060cc - resto/ ex-hsc project.

Something else to check for:
After a short trip feel to see if your battery is hot. My alternator was over charging and I got the rotten egg sulphur dioxide smell. basically it was the battery acid boiling!

Very bad for you too! and because I have a van it was coming from just behind my seat.

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-James.

Toyota 4EFTE Powered Minivan.
102 Kw @ The Front Wheels....Oh What a Feeling!

Thanks James, you were spot on. Couldnt take the car for a drive cause it wouldnt start! Checked the battery and there's battery acid all over it and the cells are now dry. So just coincidence that it started to stink just after i fuelled up.

So what caused that?

Probably the voltage regulator is faulty.
After you fit a new battery, measure V across it with motor running.
Anything over about 14.4V you need a new V regulator (if it's got an alternator) or reg adjustment if it's a generator.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Have you ever put Unleaded in the car before, its usually the Cat Converter that produced that rotten smell, does you car have a cat converter. and is your ar set up for unleaded....just a thought, sorry....

Unlikely it's got a cat

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Simon

The adventures of an owner builder in the Tallarook Ranges