Home › Forum › Ask A Member › Elton Ace Carb bubbling › Re: Elton Ace Carb bubbling
If I had to guess, from what I see..
The carb is flooding, and fuel is being pushed out of the top vent whenever the intake manifold pressure rises above atmospheric.
If you’ve ever been able to carefully observe the intake on a running engine, you’ll sometimes notice that fuel charges are repeatedly ejected from the carb mouth and then abruptly sucked back in, as the cycle progresses. This is the result of pressure in the intake rising above atmospheric during a cycle.
If the fuel level in the bowl is too high, I can see a situation where the pressure pushes fuel right out of the carb vent.. as the same pressure that bears on the intake also bears on the fuel in the bowl, via the main jet (and possibly other passages).