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andyfallsoff
Make sure the tyre is sitting over the valve core. Push the tyre down on to the rim with your palm over the valve core when you open the air shot.
If the tyre is tight enough on the tape it will go up - I find that when they are tight the tyre tends to straddle the valve core so half the air just blasts out and up the side of the tyre from the valve. Worth taking a time with a tyre leaver to make sure it’s sitting over the core.