How is this vent tube attached to the carb?

[Uncle Enzo]

I was cleaning my filters last night and noticed this bowl vent tube was loose. Its not going anywhere but does have wiggle room. Ive looked at the parts diagram and cant see how its attached. I am thinking its just a pressure fit. Id rather leave well-enough alone if I can. Carbs are Weber 40s

[1QuickS]

The end has a reduced diameter that passes through the top cover. It is retained by upsetting the end (riveted).

[KTL]

I believe they are either flared underneath the carb top covers, or there's a C-clip holding it in place. I recall my former Weber 46 had vent tubes that were a little bit wobbly and they were fine. Best to not worry about it.

[Uncle Enzo]

Thanks, Fellas!

[1QuickS]

Vent pipes work loose due to torsional vibrations of the engine. They can be tightened by using an arbor press and a flared tool to re-set the riveted end or you can buy a replacement vent pipe kit from me.

Many times the inside end of the pipe is rusty and drops flakes of rust into the float bowl. These later end up on the tip of your idle jet.

[Uncle Enzo]

Originally Posted by 1QuickS

Vent pipes work loose due to torsional vibrations of the engine. They can be tightened by using an arbor press and a flared tool to re-set the riveted end or you can buy a replacement vent pipe kit from me.

Many times the inside end of the pipe is rusty and drops flakes of rust into the float bowl. These later end up on the tip of your idle jet.

I was hoping you would weigh in on the situation, Paul!