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Have a look at the cap itself.
The rubber 'o' ring or gasket starts to crack up over time. This lets air in and vapor out.
If it works, its a cheap plug and play fix.
there was another thread about it somewhere which prompted me to do mine as a maintenance item. I'll see if i can find it an post it up.
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Don't care......was made to care! (my Mum)
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