Hi Susan, Is it a TDI (with turbo) as they have an anti stall valve linked with hoses onto the throttle valve and the air filter housing lid.
Steve
February 2010
could be fuel filter head [if it is the one with primer on it]air leak ,causing fuel to run back over night,also check pipes down back of engine for chafing causing pin hole in them also if none of these it could be metal pipes on fuel tank corroded where main pipes fit.[ may be part of tank unit.]
k
January 2010
Automatic Answer
We may have found other answers which could help you.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix cars.