Can this crack cause a vacuum leak?

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Charlie207

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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.
 

GMCChevy

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A bit of silicone, glue gun, electrical tape, jb weld... Easy fix.
 

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