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Filler cap switch/lever - what does it do?

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Old Mar 23, 2011 | 08:53 AM
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Default Filler cap switch/lever - what does it do?

I am trying to diagnose a problem with pressure build up in my fuel tank.
I notice that if I remove the petrol filler cap there is some sort of lever just inside the filler tube which I presume is engaged when the cap is screwed in.

Can anyone tell me what this lever/switch does?
 
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