Are you unscrewing the presta valve stem tip, then tapping the top of it to break the air pressure seal? Then put the pump end on, about halfway down the valve stem, and pump. You may half to flip a lever on the pump end to get it to seal right. Also, you may get some initial resistance until the presta valve opens up.
__________________
1989 Schwinn Paramount OS
1980 Mclean/Silk Hope Sport Touring
1983 Bianchi pista
1976 Fuji Feather track
1979 raleigh track
"I've consulted my sources and I'm pretty sure your derailleur does not exist"