According to The Detroit News, the National Highway Traffic  Safety Administration is turning up the heat on its investigation into  faulty Volkswagen fuel pumps. The administration has announced that it  is currently looking into 97,272 diesel Volkswagen and Audi vehicles  after receiving a total of 160 complaints about the issue. NHTSA says  that in roughly half of those complaints, the bad pumps resulted in an  engine stall on the highway or in traffic that prevented the engine from  being restarted. Even so, no major accidents have been attributed to  the faulty pumps, though one minor fender-bender has been reported as a  result of the issue.
The investigation covers 2010 Golf hatchbacks, 2009-2010 Jetta sedans and certain 2010 Audi A3 models as well.
Volkswagen says that the fuel pump issues that it has encountered  have resulted from diesel fuel that has been contaminated with gasoline.  The company says that even a small amount of gas mixed in with diesel  fuel can cause the pumps to shut down. Unfortunately for thusly affected  owners, fuel system damage due to using the wrong fuel won’t be covered  under warranty.
Meanwhile, Volkswagen has informed NHTSA about 120 separate fuel  slip-ups, some of which came courtesy of dealers and service personnel  using the wrong fuel.
Source:Autoblog