Carb seal and vacuum?

So on a yamaha of mine there was a shitty old cardboard type seal/gasket thing separating the bowl from the top of the carb. When I took it apart for cleaning the thing disintegrated (I was careful but it was 40 years old, what can I say?). I ordered a replacement from ebay but it wasn't the right shape (despite saying it should work, oh well).

I'm guessing that the reason I'm not getting fuel now is that even though the bowl is filling there's not enough of a vacuum to suck gas from the bowl to the carb because the seal isn't tight enough?

Any ideas? Suggestions for making my own seal/gasket?


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