I had the same problem on my 126. If you open the door to the fuel fill area you will see a hole about a 1/2" or so in diameter that allows rain water and spilled fuel to drain out of that small compartment. On mine that hose that connects to that drain had come disconnected. I found the problem after removing the carpeted panels inside the trunk. I reattached the hose and put a tie wrap on it to hold it in place. So far, so good