I can’t seem to figure out for the life of me why I’m running into this issue:

I’ve been using the electric air pump pictured on the right to inflate my float tube. It works perfectly fine but it’s super loud and needs to be plugged into my car’s 12V outlet.

I picked up a battery operated RYOBI inflator pictured on the left in hopes to be able to replace the electric pump, but I can’t seem to get it to inflate all the way.

The RYOBI will inflate maybe 90% of the way and then it doesn’t seem like there’s anymore air going in. I’m using the same nozzle for when I use the electric pump and no matter how long I let it inflate, it still will not completely fill it up.

Any idea on why this is happening???