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Is it not the plastic cap on the Shraeder valve on the fuel rail?
 

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Discussion Starter #7
As marks152 states its for measuring the fuel pressure, you can also use it to depressurise the fuel system, if you remove the plastic cap you will see a schrader valve (like whats on your wheels).

Cheers both ...this is the first car i've had with this on and never seen it befor

Cheers again
 
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