I have a 94' jetta GL 2.0. The thing runs great, up until I get to 3/8ths of a tank of gas. then the car runs rough when i accelerate, and hesitates almost to the point of dying when i make right hand turns. Ive asked around, and the only advice that made since to me was to check the secondary fuel pump in the gas tank. They said there might be a problem with the fuel pickup line. Does anyone know if this is a common problem? Any help is greatly appreciated.