If the vehicle is hard to start after setting overnight, the problem could be the fuel pressure regulator has failed and is allowing the fuel pressure to bleed off. A failed fuel pressure regulator will should be replaced.
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Most reported 2008 Nissan Versa problems
I own a Nissan Versa 2008 hatchback. After I pull away from the gas pump, the car was losing its acceleration and stall. I was trying to start again but it wouldn't turn over. The car was towed.
I was told that the fuel pump went bad. My basic warranty expired two months ago (December 5, 2010). The fuel pump was recplaced at my expense.