I have 3 pecan trees, 2 of which were here when I was a kid, and I'm 72. It's been several years since they had pecans on them. Sure would like to see a bumper crop like we use to get.
Some trees go as long as ten years between crops. Too much rain or not enough will stress them. They need fertilizer twice a year and might need some type of spraying to control pests. We only had seven when I was a kid but one was over a 100 years old and still produced some good crops. Do you know which variety you have?