Other Fuel System Tank Filling/charging problems of the 2009 Cadillac DTS

Have been smelling gas after fill ups for several months. Each time I fill it and park it in my garage it fills with gas fumes that could explode and kill someone unaware. Odor leaves after driving 30 miles or so. Got check engine light and o'reily auto parts check and said it showed fuel issues. Took car to my gm dealer and they say need a new gas tank, a new gas cap and new evaporative lines because I have a leaking gas tank leaking at or near filling area, and gas cap is not good and lines are leaking according to a "smoke" test. Repairs are $2,800. I am 75 yrs old and have never had a gas tank leak at the "neck" area after owning some 40 different cars, some of them very old. I believe this may be a factory defective product and a dangerous one at that. It is currently at the dealer and tomorrow I will pay $175 for the smoke test but I cannot afford to fix it so I will only fill it to the 12 gallon point instead of full. Please advise if there is a recall or perhaps other Cadillac Dts owners with this or a similar problem.