2001 Pontiac Aztek

I recently had to replace my fuel filler pipe and my fuel pump. Just before going to the garage, I began to have difficulty filling my tank. After the repair, I still have difficulty filling my tank and it is also difficult to start my car each time.. I also smell gas after starting my car. I do not have a light on in the panel to suggest getting it serviced, so I assume there is no code registering. At a loss as to what it could be. Please advise