Inner tube leaks through valve when on the wheel

Airlane1979

Regular
Location
Darlington, UK
I found my front tyre deflated. On examining the tube I found no leak. I inflated the tube and it stayed inflated. However, when I put the deflated tube back into the tyre and on the wheel and re-inflated it, the tube leaked through its Schrader valve. What might be the cause and solution?
 

T4tomo

Guru
the valve is farked, additional pressure of being constrained inside tyre is making the leakage faster and hence noticeable.
....get a new tube....
 
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