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Dave Plowman (News) Dave Plowman (News) is offline
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Default Automatic air vents - central heating...

In article ,
Spamlet wrote:
It's very like an old carburettor float chamber; that one used to have
to tickle to get it to fill right up.


The purpose of the tickler was to flood the carb thus giving an over rich
mixture for cold starting. Not to allow it to 'fill up'. In other words it
disabled the cut off valve by lowering the float.

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