I cant imagine using a funnel. If you do, you will have to tap the funnel/hose/valve stem constantly to keep it from clogging. I use the little plastic injector bottle. You squeeze and release the bottle, over and over. the pressure pushes some beads in and then when you release, the vacuum lifts the remaining beads in the air. That way, the beads dont clog. With a regular valve stem, I have filled a car with beads in 5 minutes or so. The angled valve stems on my ST took much longer... 10-15 minutes. At first it looked like nothing was going in the tire.