I am trying to rebuild a BG 220 fuel pump from 2009. Having trouble removing the cup after I got the impeller off in order to replace the shaft seal. Is their a trick ?? Seems to be some kind of phenolic or plastic base. Was thinking maybe a heat gun ?? Slowly trying to pry out can only get half way out. Wd 40 seems to have made it swell and worsen my plight. Can anybody steer me in the right directiony. Thanks