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MG MGB Technical - Blocked fuel vent

I cannot locate the fuel vent on my 1964 mgb roadster.
I have been through the manual and the onlky ref I can find relates to the fule cap. Mine has a lockable cap which I think is a replacement and there is no obvious vent. A tremendous vacuum builds up in the tank and has caused the car to stop twice when it gets down to about 1/4 full. Releasing the cap solves the problem.
Any thoughts would be welcomed.

Les Howard

You need a vented cap.
John H

John H is correct, UK spec never had a vented fuel tank, always a vented fuel filler cap. There are lockable vented caps, both my MGBs have them.
Paul Hunt

This thread was discussed on 04/06/2008

MG MGB Technical index

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