Side/window Air Bag problems of the 2003 Buick Rendezvous

Bought my Rendezvous a few months ago and have had problems. My side air bags deployed with the previous owner for unknown reasons causing him injury to his ribs. They were never replaced by manufacturer. When I first got my car I filled up the tank. Bad idea! I came out the next morning and smelled a strong odor of gas and was missing a quarter tank. My boyfriend looked underneath and said it was leaking between the fill tube and the actual tank. My mechanic said there is no way to patch this and the only way to fix it would be to replace the whole thing. Approximately costing $1000. He also said changes are this will be reoccurring because it's a common problem with this make/model. So now I only put a half tank in my gas tank but I've noticed a smell of gas inside and outside of the vehicle. When I first bought my car the next day my car wouldn't start. I had a dead battery. My interior lights never turned off. Again, to repair this electrical problem would have been expensive. I ended up taking the sensor out, so now I have no inside lights at all.

While turning into an intersection vehicle was involved in a frontal collision. Upon impact neither front nor side air bags deployed. As a result, driver sustained severe facial injuries.