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As others have stated, try a valve core removal tool. You can replace it quickly and then just pump it up. Decades ago I did HVAC work and there is a tool that allows you to change a Schrader core under pressure.
........, I have two of those I use for evacuating HVAC systems. They allow me to remove the valve core without losing any pressure or allowing any air into the system if I`m evacuating a system. They work really well....
I would lean towards the chuck being bad. I asked my teenage grandson to air up my GPW's tires and he tried for a long time and said the tire has a hole in it because he could hear air coming out as he was putting it in. After he left, I tried it and it worked fine! Apparently he wasn't pushing the air chuck down hard enough to depress the center pin. Does your air chuck have the trigger type with the gauge? Does air come out when you press the handle, or trigger? If not, squeeze the handle and press the center pin to see if air comes out. I have several types and one of them is just a plain chuck that plugs into my air line. No messing around there and it's easy to release too much pressure from the tire with a gauge/checker.
I would lean towards the chuck being bad. I asked my teenage grandson to air up my GPW's tires and he tried for a long time and said the tire has a hole in it because he could hear air coming out as he was putting it in. After he left, I tried it and it worked fine! Apparently he wasn't pushing the air chuck down hard enough to depress the center pin. Does your air chuck have the trigger type with the gauge? Does air come out when you press the handle, or trigger? If not, squeeze the handle and press the center pin to see if air comes out. I have several types and one of them is just a plain chuck that plugs into my air line. No messing around there and it's easy to release too much pressure from the tire with a gauge/checker.
Yep, that was it. Replaced chuck, all good, thanks!
This is the best air "chuck" I've ever used on my bikes... and cars... and trucks... and trailers... and RV... Well, you get the idea..
Pros and cons I guess. The locking type chucks can be good in certain applications. For example on the big truck tires that take forever to fill. On the kids bicycle tires I found if you pull the tube nipple up and clamp a small pair of needle nosed vice grips on it to hold it in place then you can clamp the chuck on and have one hand for the fill lever and one hand to feel the tire or hold the wheel if it's free spinning. However, I have yet to find one that fits the wire spoked rims on my bike where I need to use a short angled chuck. My tire gauge has a loose fitting chuck so I can switch it up to whatever chuck I need. But, I will say I've never tried one with the long straight locking chuck.
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