bought this to fix fuel drain back problem

I`ve wondered about check valves myself, but never tried.
My only experience with these were on RC aircraft engines, whole different animal though.
I remember taking it off, but for why I cant remember:banghead:
I think for priming, fuel wanted to keep flowing and when shutting off, it would spit a bunch of fuel out.
May not affect a car carb at all. Leave your breather off when testing to see.
Anxious to hear how it goes.