Oil In Diesel

[Yetirider]

Hi all. I own a 05 20ltr 140bhp a4. It has a problem with oil getting into the diesel! It blocked the fuel filter to the point it starves the engine of fuel on motorways which results in the car juddering to a halt, it will not imediatly start but give it 20 mins and away it goes. So, i fitted a new fuel filter today and it drives on motorway ok again. I cut the fuel filter open and can only describe its element as saturated in oil,i bled some fuel away from the tank and it looked more like a cola colour than clear diesel. Any ideas???? Thanks

[Crasher]

You need a new tandem pump.

[Yetirider]

Is that a common problem Crasher? Does the oil leak fron vac side or fuel side? Where is the best place to get 1. Is it audi only?? Thanks for your help.

[Crasher]

Yes it is very common, lubricating oil for the tandem pump gets into the fuel side. They can be bought from GSF and such places.

[Yetirider]

Sound. Could this pump contribute to rough idle,revs dropping as if its running on 3 and hard starting ?

[Crasher]

The oil contamination will contribute to that problem.