I have a 2007 A4 1.8t Avant and I had it Revo'd stage one last Saturday. Its been an absolute nightmare ever since. First of all one of the coilpacks packed in, which is fine, got 2.0t coilpacks with adaptors fitted yesterday...haven't been able to try them out yet though because on Monday (Driving it with a misfire for a couple of days and running very rich at that) pulling into work, the car died and wouldn't start. I was able to park it at work and last night I spend a good hour trying to find out what was wrong. There was petrol all over the ground so I had a bad leak, that was obvious. Upon pulling off the covers under the drivers side I was able to assess there was no leaks at the fuel filter connections which I thought it was because I changed the fuel filter 20k ago and thought the fuel pressure caused one connector to blow out. But then I found out exactly where it was leaking from. Its hard to explain - basically there are 3 fuel pipes running down the underbody of the car and 2 are connected to the filter fine, this magical 3rd one goes NOWHERE. It ends near the fuel filter but has no bends, no connecting pipe, nothing. It looks like its been cut, but its not, its just open ended as if something goes on it but theres nothing near it? Somebody has mentioned to me a blanker goes on it for the diesel models that has a diesel cooler? Every time I turn the car over it just gushes out of this pipe, some kind of return pipe? Its blowing my mind, I've even started removing the fuel filter to try and see if I can find the pipe that it connects to, maybe it blew backwards with the pressure? I'd really appreciate if anyone could take a look at their fuel filter or have nay ideas because I'm quite desperate and distressed at the moment to say the least!