general problems of the 2010 Nissan Versa

When accelerator pedal does not always get car moving. There is hesitation. At a stop, put pressure on accelerator pedal, car doesn't move, but then will engage after a some seconds, and jump forward. I've been at a stop either stop sign or red light and if on a hill, will roll backwards because I cannot get any acceleration in car. When driving on highway, will sometimes stall out, but will then pick up acceleration.

There was no actual accident, but I am extremely concerned. On November 8th I was just starting on the highway, so not even at speed limit, when I felt that pressing on the accelerator it hesitated. I noticed it a few more times and then the service engine light came on. I took it to the dealership and they said to return a week later for the earliest service appointment, but that it was safe to drive. Once in for servicing, I was notified that it would need a new fuel pump because there was a leak. I spoke to another company and they said it seemed odd that for such a new car, it would need a new fuel pump. They also said that having my speed affected was very dangerous. My car is a little over 75,000 miles. I am unsure what to do in such a situation and feel that for safety reasons this should be investigated, especially having read of other such issues with Nissan Versas online.