Fuel in vacuum port covers?

Has anyone ever seen fuel in the vacuum port covers? I was doing a carb sync and all 4 had fuel in them. There is no fuel coming out of the overflow tubes so just can't figure out why so much fuel would get past the carbs.

del

if you pull one off and it doesnt have gas in it it means your outta gas.

I figured it was normal but the amount seemed excessive. Just wanted to make sure. Thanks for the info!

del