Unless the hose is really bad you won't see it. It occurs when you are tooling down the highway and a suction condition is created by the operation of the engine under demand loads.

1953 Chevrolet 3600
Fried Green T'mater (Vern)
In the Stovebolt Gallery
Caution: Political Statement
Man who runs in front of car gets tired, man who runs behind car gets exhausted.