So my front tire was low on air...I tried to pump it up using my $25 REI floor pump...I wasn't getting any air in and the pump kept popping off of the valve. I thought the pump was defective since it was a cheapie and I hadn't had problems with it popping off the valve before. I went ahead and put a new tube on the bike and tried inflating that one....pump popping off again, no air getting in...

So I returned the pump and got a new one... This one screws onto the valve. I again attempted to pump up my (now new) tire tube, and and meeting resistance immediately and the gauge is reading 160 on the pump so I'm not attempting any more, but not getting air in the tire either...Thoughts??