Originally Posted by bigfelipe
My understanding is that the tube is a breather and should be open. Why does it need to be sealed for my gen to run? Anyone able to shed some light on the subject? I'm on the road now so my ability to test things is limited.
I am not sure which tube you are referring to.
Do you have a photo?
get a selfie stick and grab a pix.
On the gasoline Onan, the tube is the static port for the carburetor.