Take the air cleaner off after running it (so you know the bowl is 100% full) and look down the barrels while you push the throttle lever back. Whether or not the accel pump is working should be pretty obvious. Pay close attention to what it's doing at the beginning of its travel.

If it is working, have you actually tuned your idle mixture based on RPM or vacuum? Two turns out could be completely off for your engine if you haven't checked anything beyond the number of turns you made initially.