got a 92 passat 2 weeks ago. replaced the heater core by myself and alot of beer and swearing but got it done in under 7hrs. heat works but now the car wont. i am thinking that it is the fuel pump. when i started the car i could noticably hear the pump kick in when the key was turned but now nothing and the car will start sometimes and then it sputters and shuts off. does that sound like fuel pump? also now that i reconnected the coolant lines to the heater core there is a coolant leak? anyone hear or this before. also what are some other heads up that i can look for before they happen. i do alot of my own work and i am going to do a major run through and fix up on this car to get it running like new. i would appreciate any help or advice that you guys could give me. thanks.