What are the reasons why a new pump cannot inflate?

[McLuke]

The reasons why a new pump cannot inflate include issues with the valve pin and poor connection. Valve pin issue: When connecting the pump to the valve, the valve pin is not pressed into the valve, preventing compressed air from entering the valve. Solution: When connecting the pump to the valve, ensure to perform a pressing action to confirm the valve pin is pressed into the valve before inflating. Poor connection: A poor connection between the pump and the valve causes air leakage. Solution: Reconnect the pump and the valve accurately, ensuring the valve pin is pressed into the valve before inflating. When using the pump, attach the air hose to the bicycle tire's valve. The valve's function is to allow air to flow from the pump into the tire but prevent air from flowing back from the tire into the pump.