Other Fuel System Tank Mounting problems of the 2005 Nissan Sentra

I purchased my 2005 Nissan Sentra from a private seller in 2007 with the total mileage of 9,100. After six months of driving the service light came on and I took it to my mechanic whom I have used for all my automobiles. I was told the seal on the vapor hose was loose and he could tighten it, but it would only be a temporary fix. The cost to repair the seal was out of my price range. Since 2007 the service light on my dash would light up intermittently whether the vehicle was in motion or stationary. I would have to wait for the light to switch off before I could go for an inspection sticker. A couple of times the inspectors at the station told me of the vapor leak and were nice enough to tighten the seal to the vapor hose so the car could pass inspection. To date the seal on the vapor hose has not been repaired and I am concerned about a fire hazard. It is understood that the VIN on this specific 2005 Nissan Sentra does not fall under the NHTSA campaign #05v269000 for the fuel tank vapor hose. What I do not understand is why this vehicle is having this specific problem. And it is a problem. Started 01/07/2010.