I have searched and searched but cannot find a good diagram of how the fuel tank internals work on a 97c230. Am I understanding correctly that the fuel is actually being pulled from the driver's side (u.s.version)? When I knock on the bottom of the tanks the drivers side is empty and the passenger side sounds full. It will only let me put in about 2 gallons and runs out of gas at about thirty miles. I bought the car wholesale and have no idea what the history is. I have found enough to know the tanks are a common problem, but very little in how they actually work.