Welcome! It has been my experience that using a presta converter on a scrader-equipped pump is its own little skillset. I have done it successfully using a powered pump, but never with a manual device. In short, the angle of the presta adapter relative to the presta valve is critical. The adapter will seal to the valve, but only when held just so. There is very little margin for error. I'm sorry, but I can't describe it any better than that.
I began with a powered pump and the adapter. Experimented with the angle and physical pressure on the adapter until I heard air begin to flow. It can help a lot to separate the noisy pump from your bike as much as possible. The sound of the air flowing into the tire is much quieter than the sound it makes escaping.
I hope this helps. I haven't used that setup in some time because I found it was easier to buy a floor pump with chucks for presta and schrader valves. I still carry a presta to schrader adapter for emergencies. If budget is tight, the adapter will work with practice, but it's fiddly and frustrating, especially at first. If possible, a pump with the proper chucks already present is so much easier. If not, you'll have to practice a bit more. Not a big deal.
I began with a powered pump and the adapter. Experimented with the angle and physical pressure on the adapter until I heard air begin to flow. It can help a lot to separate the noisy pump from your bike as much as possible. The sound of the air flowing into the tire is much quieter than the sound it makes escaping.
I hope this helps. I haven't used that setup in some time because I found it was easier to buy a floor pump with chucks for presta and schrader valves. I still carry a presta to schrader adapter for emergencies. If budget is tight, the adapter will work with practice, but it's fiddly and frustrating, especially at first. If possible, a pump with the proper chucks already present is so much easier. If not, you'll have to practice a bit more. Not a big deal.
