Tank Assembly problems of the 1998 BMW 740

Fuel tank "tin cans" when lower on fuel. Fear degradation of fuel tank. From other sources, this is a known problem with Bmws.

The contact owns a 1998 BMW 740il. While refueling he noticed gas was leaking form underneath the vehicle. Once he stopped pumping gas it stopped leaking. This failure recurred whenever he would refuel the vehicle. The vehicle was not taken to be examined for the cause of failure. Over time he began to hear a thumping noise coming from the fuel tank while driving or stopped. The vehicle was taken to an independent repair shop where he was informed there was a split on one of the seems for the fuel tank. The vehicle was then taken to another independent repair shop where the fuel tank was repaired. The thumping failure continued to recur so the vehicle was taken back to an independent repair shop where the fuel tank was replaced. The thumping failure continues to recur. The failure mileage was 178,000 and the current mileage was 180,000.

Hi, I brought this car from another person (original owner),he told me that the car makes a weird noise when sitting or driving he couldn't tell me why it was happening upon further inspection found fuel tank to be sucking in and out I didn't pay to much attention thinking wasn't much to it until one day went to refuel vehicle wasn't able to get any gas into vehicle,upon inspection found gas tank had imploded beyond repair,I spoke to an advisor at local BMW dealer if there was any bulletins on issue he told me no at first,he then asked a tech at dealer about issue he said the evap canister system had something to do with ,so there is some knowledge about issue my question is due think that there should of a recall or campaign out there regardless of year of vehicle since I think its a safety issue to me and my family as well as to the next person who gets this vehicle,aswell its very expensive repair when I believe its BMW responsibility to recall all these dangerous tank issue. Hope you can help me and guide me in right direction resolve problem overall I like the vehicle.

Notice a bumping sound for rear of car when stopped and running. Fuel tank is imploding!! also, noticed that gas tank makes a whoosing/sucking sound whine the gas cap is removed. Heavy gas fumes when the car is sitting. Noticed very strong gas fumes. . . . . Gas tank is now leaking! I have taken the car to the dealer and am awaiting to here back form them. Was told that this is a normal issue with the 740il. Was told that I need to have the tank removed and replaced with a new unit. Quite costly!!! was told that BMW has a service bulletin for vent lines but they were not very helpful. Called salvage yards hoping to find a used tank and was told that 740 tanks are very hard to find because they all spring leaks. If this is happening often why not have BMW address the issue??.