Got the same problem, bought the van 6 months ago, had the same cuttting out problem as described here.
The local Vauxhall dealer then finds out the van had a fuel pump fitted in october 2006 & again in Feb 2007 both under warranty.
Now in October 2007, van just out of warranty with metal filings from the knackered fuel pump contaminated all the fuel lines...so I am in for a £3500 repair, on a van I paid £7500 for 6 months ago !
So it is going to have tank swilled out, new fuel sender, new fuel pump, new fuel lines, new injector pump, new injectors.
At least I get a 12 month warranty on parts & labour, so the filter will be off every month checking for metal bits.
VAUXHALL CUSTOMER SERVICES....WHAT A JOKE !!!!!
Spoke to them to see if any contribution could be make towards the costs, as- if the warranty work had been carried out correctly in either October or Feb, the fuel system would have been replaced under warranty.
They were as much use as a rubber crutch !
The answer was in no uncertain terms TOUGH S#*T !!!!
My advise is don't touch a Renault Traffic / Vivaro or Nissan Primastar they will cause you grief....I have driven a Merc Sprinter for the last 8 years with little or no problems....
If you have one of these vans get rid AS SOON AS POSSIBLE !!!!!!
Don't wait for the warranty to end you are on your own