I have an opportunity to purchase a 1999 TDI beetle with 132K showing. The seller says it has a fuel leak "up front in the engine area". The battery is low so I have not been able to start it even after a jump. It just spins but no smoke or fire. The car ahs new tires, brakes, timing belt, water pump, headliner and door panels. She is asking 3300 but I have her down to 2500 (provided it will start). What could be the cause of the fuel leak and what are the cost of the repair?