Can this crack cause a vacuum leak?

[abdullah_Zahra]

Many Thanks for all. I will just get a used one from my local salvage yard.

 

[Charlie207]

I would gently melt it back together with a soldering iron, and snip off a strip of similar material from that big tab (on the left side of your picture) to use as filler.

I did that to a hole in my intake manifold, and it's holding up great.