My Raptor's been on for nearly a year,... I never turn it off, except to remove the tank or do carb work...
All my other bikes had manual petcocks and I never shut them off either...
You
could potentially have a problem,...but I never did...
It's about as likely as having your vacuum operated petcock go bad, and has the same result...
Oh,... wait,.. I did have
that happen,... twice....
...on two different Savages....
Now,..
Everybody form a circle...