Gas Gauge

I just recently purchased an 04 SE 4X4. I read the other threads about various problems with the gas gauge. Mine is similar, but a little different. My gas gauge does go all the way to full, but when the gauge reads empty it will only hold 18 gals. The previous owner hadn't had any of the recalls fixed. So I took it to Nissan and the gas gauge didn't come up as a recall. Was there a recall for later models, but not the 04?