Help!! Fuel hose disappeared?!

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!

I know, but it will be the same and for all I know I could get better information from someone who owns a B6 for the sake of limiting my scope to the B7 area

pauldazzle said:

All 3 pipes should be connected to the filter. 2 inlets + 1 out. Sounds like you have a missing extension connector pipe. Parts 28 & 29 in the above schematic.

Click to expand...

Its at the fuel filter end, is parts 28 and 29 not around the engine block? and surely it couldn't be that bad that that a whole pipe and 2 connectors disappear down the road?

I will get some photos tonight but in the meanime I'm thinking the best thing to do is probably see if I can get a look at another a4 around the fuel filter, thanks for your help guys

had a look at that, he only has 2 pipes going from the filter through the cover towards the front of the car, mine ends just behind that cover so I really need to see under that cover!

Ok I think I've sussed it...not 100% sure though...Basically I've tracked down all the pipes and understand where they're going, the pipe that is open ended is actually the breather for the carbon cannister and I think the fuel is getting in where only vapour is supposed to get in because the fuel filter has failed. There are 2 inlets and 2 outlets and the fuel going in is going out the wrong outlet...getting a genuine Audi fuel filter on Monday and hoping this will sort it.

I got a notification for jammah's post by email and I've been trying to remember what the problem was all day but I can't! I know it was something very silly to do with the fuel filter but I can't remember what exactly so I'm afraid I'm pretty much no use. I remember the fuel ******* out of the return line because it wasn't going into the engine, it was jump started and that ruined the air suspension management.