Hello everybody, I'm new to these forums and very new to biking. I have a very simple question that no doubt has been covered here before.

I have a road bike whose tires have presta valves. I've tried pumping them with a floor pump but for some reason they're not filling up? Doing the correct things, taking the valve off halfway and "locking" the pump on, with not much progress. Does the pump have to be latched on all the way down so it is touching the tire, or does it only have to cover the tip of the valve?

Many thanks for your help and comments! Thank you for reading.