well, a couple of things come to mind based on what you have said here. First, you said "we use citrus fertilizer a few times a year" That may actually be to much, especially if this is in a lawn area and you are also fertilizing the lawn. once in spring and once in fall is plenty. To much fertilizer, especially nitrogen, will make lots of green growth and little fruit. Just stop using the citrus fertilizer for the rest of this year and use it sparingly next year, maybe half the rate recommended on the bag. Or better yet, convert now to a mulch based system. Mulch is better for the tree, doesn't risk polluting the water table, is cheaper and uses the material you already have from your yard so cuts down on waste going to the land fill. Best of all though it just grows GREAT citrus.
Second, since you say it gets water from the lawn sprinklers, I'm guessing that the tree might have grass growing fairly close to it. I recomend removing all the grass out to at least 2 feet out past the reach of the branches. Citrus does not like grass growing under it. Again this is where a good mulch can be helpful, covering the ground where you don't want the grass. It also helps keep weeds out. (Note if it's bermuda grass though, mulch alone won't stop that. Lay paper and cardboard down first to create a barrier then mulch over that.)
One other factor may be important. a year and a half ago we had a really hard freeze. If your lime got hit, it may still be recovering from that and need one more season before it bears fruit again. If so, just keep doing what has always worked, including the improvements mentioned above, and it should be bearing again next year.