S4 2.7 PROBLEM!!!

[MUSSIE2007]

Hi all my 2.7 Bi turbo smells strongly of petrol when running, think its overfuelling but not sure why. No leaks or smells under bonnet and no smoke from exhaust, but exhaust emmissions smell like you're in a refinary!!
any suggestions? cheers.

 

[Siena]

Most common culprits are MAF, Lambda Sond or coolant temp sensor.

Easiest way to find out is to get fault codes pulled.

 

[Siena]

If the smell's more like unburnt fuel, it could be a leaking / weeping union.