Will not start, not getting fuel?

I removed both A/C compressor and alternator. Bought wrong A/C compressor so I had to put the original back forgot to plug the alternator back in and the battery drained out. Switched batteries drove home plugged alternator back in. I had taken the black breather assembly off the engine when I changed batteries because the battery was too big, but covered the intake hole of the breather with a towel. When I got home to plug my alternator back in my car would not start. Not getting any gas.