Drilling a hole from underneath is also dangerous as the tip of the drill might get hot enough to ignite fuel vapour as it breaks through into the chamber.
Of course if your non-return valves are working properly there should be very very little fuel vapour in the cross member as the engine inlet will have sucked it out and the non-return valve will have stopped vapour fuel from travelling from carbs down to the reservoir cross-member.
With the non-return valves working, the only air in the cross-member should have ultimately come from the vent in the headlight vacuum slider 'switch', when you 'released' the vacuum.
36/6725 S3 Coupe OGU108E Yellow over Black.
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