Float level and fuel/air mixture

[Guest]

Can someone explain the relationship between the float level and the fuel/air mixture? I've read that a low or high float can cause lean or rich conditions. How does this happen? I see the floats as a control to regulate the fuel level in the bowl. I just don't understand how this can effect the mixture. Please enlighten me.

Cheers!
K

[tkent02]

Higher fuel level makes it richer, there's less vertical distance from the surface of the fuel to the venturi, so a given amount of vacuum pulls more fuel up into the venturi. Opposite with a low fuel level, the same vacuum will pull less fuel into the venturi.

[Guest]

Ah, it makes sense now. Thanks tkent02 - you even helped out an L rider.

[tkent02]

Doh!! Had you told me that before I would have come up with some BS about how it scrambles intermolecular energy fields in the hydrocarbons or something.

[Guest]

Saw THIS posted a few years ago (while still lurking), maybe it will help, too.