Are you sure it's not getting spark? It seems like an incredible coincidence that you just rebuilt your fuel pump and spark is the problem. Any time that something is just messed with and something goes wrong, 99 times out of 100 whatever you just messed with is the culprit.
This being said, the issue with your battery installed wrong muddies up the water. You obviously had a problem with starting prior to the batter SNAFU, so if you're not getting spark, I wonder if it's two separate problems. The first having to do with your fuel pump you rebuilt and the second with the lack of spark (which I would attribute to the battery being installed incorrectly until proven otherwise). If I were you, I'd re-verify that your spark plug isn't firing. If it isn't, that would be my first priority