Same thing here. FSU replaced twice since June. Slow to show fuel (hours for needle to climb) when I fill up, then gets erractic, dropping to E and up, and down, once I get at about 1/2 a tank. The Nissan tech at my dealer now thinks it is the wiring and fuel guage in the dash (he said the first FSU was bad, even though the problem is the same since the 2nd FSU was installed). I told him it all worked fine until the recall was complete. I am at a loss. They think the FSU is good. The unit I had installed last summer before the recall worked better (but it was destined to go bad after about 40,000). I am at a loss.