Tank Mounting problems of the 2004 Infiniti G35

The medal bracket was cracked and makes the seat loose and move during driving. This makes the car extreamly dangerous. I have had 3 mechanics look at the seat and they have notified me that it was a failure in the steal bracket used to secure the seat to the frame of the car. I have also taken it to a Infiniti dealership and they said it was wear and tear from the weight of the driver. I am the only driver of this vehicle and I am 6'0 & 176lbs. If this seat was the effect from wear and tear, then this would violate the lemon law act. Next, this same vehicle also has a faulty gas gauge. This gauge does not accurately read the gas after a fill up nor does it ever go all the way to full tank. This was a recall on other model years from this manufacturar and was resolved. I beleive that my model, make and year was over looked for the fuel guage recall.