I just bought this car 1 week ago and it caught on fire twice on the same turnpike exit. Some how the

vacuum hose burned in half.The first time it was repaired all they did was replace the vacuum hose

because that was the only thing that was damaged.

then it happens again the very next day same damage. They found a busted gasket when I took it back and they fix the problem. But know every time I drive it, I feel worried this could happen again. And on top of that I smell gas every time I drive it. What should I do.