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If it's a presta type valve your talking about it's probably got more to do with the valve itself. If so, unscrew the nut at the end of the valve and briefly push the valve so you let a second or two of air escape. This ensures air will be able to get forced back in when you start to pump. Valves are weird like that.

If schrader valve then ensure you have the pump head fully depressed to again open the valve.
 
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