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Audi has developed a new fuel filler cap to stop owners accidently filling their diesel models with petrol.
Audi A4, A5 and Q5 TDI models for the 2011 model year will be the first to benefit from the new system.
The fuel filler neck has been redesigned to incorporate contact points that open an internal fuel flap only when the larger diesel pump nozzle applies pressure on them.
The smaller diameter petrol nozzles do not make contact, ensuring that the filler flap remains closed to prevent access to the reservoir.
Instances of misfuelling have risen significantly in recent years creating inconvenient and potentially expensive consequences.
Audi believes this is due to the increased refinement of diesel models which has seen them run nearly as smoothly and quietly as their petrol counterparts.
 

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My 3.0 TDI was delivered last week (2011 spec) and I believe it has one fitted. The fuel pipe sort of slots in to the fuel inlet. You have to push it in and like you say you can feel the contact around the fuel pump. Its a snug fit such that you could actually let go of the pump and it would remain in place. My 1st diesel so wasn't sure whether they were all like this or in fact it was for the above described reasons.

I'll leave it to someone else to test the ability to put petrol in to the car!!
 

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Great - shame they didn't think about this earlier - would have saved me a lot of hassle about 2 months ago!!!
 

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Audi believes this is due to the increased refinement of diesel models which has seen them run nearly as smoothly and quietly as their petrol counterparts.
Good news, although my Mk2 TT on occasion sounded like a diesel ( it wasn't - can't believe companies now make sports cars with diesel engines....) so perhaps not so much of a claim
 
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