Joined: Feb 2012
Posts: 19,373
Likes: 5,516
From: Rochester, NY
Bikes: Stewart S&S coupled sport tourer, Stewart Sunday light, Stewart Commuting, Stewart Touring, Co Motion Tandem, Stewart 3-Spd, Stewart Track, Fuji Finest, Mongoose Tomac ATB, GT Bravado ATB, JCP Folder, Stewart 650B ATB
iWith most floor pumps t's fairly easy to pull the piston out of the cylinder and then check the "o" ring/cup washer. Most floor pumps can have the top cap, where the piston shaft enters, removed by unsnapping it/unthreading it or by removing the retaining screw. Then pull out the piston and look at it's business end. Andy.