Nissan Repair Questions? Ask a Mechanic for Answers ASAP
Do you have a check engine light on? If you smell fuel, most likely you have a leak in the fuel line from the tank to the engine area, and the fuel is draining down. It takes a little while of cranking for the pressure to build and push it up to the engine again.
Take a look under the car with the engine running and see if it is dripping anywhere.
OK- like I said, start the car and look underneath for any signs of fuel leak. You don't want to drive around with an issue like this, fuel on a hot exhaust can cause a major fire.