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My petrol tank leaks a little when it is filled to the top - it leaks out of the pipe grommet that feeds the engine. Only does it when totally filled up but you can smell it in the garage in the morning.

Took it Audi and they said it needs a new petrol tank as they cannot repair the grommet connector - apparently this is common over here (has anyone in Europe suffered this problem). To replace the tank they need to remove complete rear axle and the fuel pump also has to be done too (apparently).

The grand total is about GBP1400 for parts and labour!! Bargain (NOT).

Anyone have similar problem and any alternative solutions. I think the tank is plastic to is cannot be welded.

see how much the postage is http://cgi.ebay.co.uk/AUDI-RS6-FUEL-TAN ... 563c55c140 get the measherments off them and i will see how much dhl will charge to you.

I think the cost of the tank is small compared to the labour etc but thanks for finding that. I am more interested to know if it is possible to replace the grommets or even seal them with petrol resistant silicone (or similar).

Out of interest, I read an article that says that refineries are adding more biofuel to petrol to make it greener. It does indeed make it greener (emissions etc) but the biofuel is basically ethanol and it is attacking/dissolving certain types of rubber/plastic in fuel systems - manufacturers are just finding this out so are having to find different types of materials to resist the new biofuel and green petrol.

As an update -

Audi said it could not be repaired.

MTM garage lifted the back seat and it shows two access points to the fuel tank top and these allowed the O rings to be replaced. The existing O rings were perished.

paul_23 wrote:I read an article that says that refineries are adding more biofuel to petrol to make it greener. It does indeed make it greener (emissions etc) but the biofuel is basically ethanol and it is attacking/dissolving certain types of rubber/plastic in fuel systems - manufacturers are just finding this out so are having to find different types of materials to resist the new biofuel and green petrol.

I think is true for the basic unleaded, but not for the high octane stuff.