Originally Posted by carbking
"(2) Looking at the YF, that same passage that vents to the exterior, also has an outlet to the interior. I really wonder if the exterior outlet is even necessary. But the engineers put it there, so I will leave it alone."

Bowl vent.

Re-read "carburetion 101, lesson 3" about atmospheric pressure.

Jon

Right, understood. But doesn’t the same passage connect to a vent inside to the “throat” of the carb?

Looks to me like the YF passage splits and goes both ways. I don’t have one in front of me, but fairly certain the Rochester B vents only to the interior.

Not trying to be obtuse or argumentative. Genuinely curious about it.

1951 3100