(Original post by Herr)
That engine in particular has been well known to have issues with the fuel pump, at first BMW thought it was only affecting cars in the US market where they had a "goodwill" buyback scheme for cars affected, many 335i, 535i, X6 and the 135i were subjected to this buyback or if the customer opted a replacement and then a 10y/150k warranty on the pump. They blamed it on the gasoline in US being "dirty" but now there are plenty of cases being reported in Germany and Austria where a lot of cars have a variant of these engines, UK is also having some a few of these problems though at this moment it isn't wide-spread.
No recall in UK or EU or Switzerland on for the purpose of these pumps. As for being replaced under warranty, dealers in Switzerland are being told to find for traces that the car has run any type of bio-fuel.... the moment such traces exist then it is supposed to be out of pocket though most dealers will quietly replace it on a goodwill basis as they rather have a happy client than a happy BMW AG.
See above. I am told it isn't common yet in UK, but from there are around 30 known cases in Zurich alone and I can tell you that the stats, 1 in every 3000 1 series sold is a 135i, 1 in every 900 3 series sold is a 335i in Switzerland... it is more frequent with the 5, 7 and X6 so it isn't all that common an engine but to have 30 cases in just Zurich alone suggests that it is quite a widespread problem.
That fuel pump CHF3500 from a dealer in Switzerland, note that this is before any diagnostics, labour, sundries and taxes are included. Not sure how much a UK dealer would charge for this work there.
The problem is it can indeed strike any car as with any high pressure pump they do fail, but the good thing to this is the pump going won't leave you stranded by the road, it will show a CEL, it can still be driven but it won't be as powerful.
If you believe the car is a genuine one, then by all means go for it, you won't regret buying this car but just make sure when it approaches closer to 3 years you extend the warranty on it for peace of mind purposes.