I see. Would what I am proposing doing help to prevent hydro lock (leaking past the carb float)?
If I understand what you're saying... you're proposing to install a manual shut-off valve someplace that
makes the OEM valve extraneous... if you're going to get a manual shut-off valve anyhow, it seems
like the easiest (also - reversible, in case you're wondering about that) thing to do is unscrew the
OEM valve from the tank, and screw in a Pingel...
-Mike