Its kind of a non-serviceable part! The pump body is not removable, but the gears are replaceable. I've heard that back in the day, racers would drill the round head brads out of the pump housings off of a GMC 6 and,reinstall the pump(GMC)onto a 235/261 engine. The pumps were supposed to be higher volume on the GMC's than the Chevy's. Don't know if there is any truth to that or not....If you wanted to go to that extreme to remove it,im sure it could be done!
