Trying to go tubeless with Fulcrum Zeros

Aarrgghh! Having gone tubeless on my other bikes I thought this would be easy; but no. My set of Fulcrum Racing Zeros I bought in 2016 and love to use have a hole in the rim which I thought was for venting of the rim space and was not linked to the tyre bed. However, as fast as I pump up the tubless tyres, the air comes out of this hole. I always thought these wheels were designed for tubeless given the lack of spoke holes in the external rim.
Does anyone know a solution to this or am I incorrect in thinking these rims will take tubeless?
Here’s hoping.
 

vickster

Legendary Member
 

Pale Rider

Legendary Member
Can you tape over the hole?

It's obviously there for a reason, but it's hard to see what catastrophe may befall you if you block it.
 
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