Old Style Filler Cap - Breather Hole

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Tazio
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Old Style Filler Cap - Breather Hole

My crossflow has no tank breathet, and no breather on the filler hose, and I know it needs one, so typically where is it normally drilled.  This cap is new to me and the car and I cannot find a breather hole in it....

Tazio
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Inside seal

Sooty
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Alan, I had one of these originally and had no issues with tank vacuuming as a result of suction from the pump so I think it must vent through the lock mechanism

David "Sooty" Sutton - Full blown Carbon Tart

Tazio
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David, Thanks for that. I 've run the engine, just to check for plumbing leaks on the dry sump and coolant systems, one day the motor was fine, second day she was missing a little, remembered old threads re breathing and vacuuming, and as I am running an electric pump, just needed to check how it breathes.
SM25T
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Is this a breather hole ?

 

Tazio
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Erm........I think you maybe correct, doh...question is, is  it the typical size required and should it be able to cope with a Facet redtop pumps demands?  I'll run it with the filler cap open first and see how she goes.

rkeywood
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Hi Alan, if that's the cap you had from me then yes, I was using a Facet pump and raced with it without issue.

Tazio
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Thank you....appreciate the info., may have to look for another cause....