The float/needle valve work just like the corresponding parts on a flush toilet,
trying to keep the liquid level constant. The level of the fuel in the bowl
is the same as the level in the jet (when the engine is not running, of course),
and this happens to be about 1/4 or 1/2" below the top of the jet.
When the engine is running, the airflow through the carb sucks the fuel out
through the jet,
with the flow rate regulated by the position of the needle in the jet. (Let's
not
get into the function of the piston and piston chamber yet...)
Doug
At 09:53 AM 3/24/2003 -0500, George P. wrote:
>Doug wrote:
>
>"If the fuel is overflowing out of the jet, you obviously have a problem
>with the float or needle valve."
>
>I reply: I'm confused. I thought that the float/needle valve simply
>controlled fuel flow *into the bowl*, NOT into the jet. The jet is gravity
>fed and the needle (on the bottom of the piston) controls fuel flow from the
>jet into the venturi. Which part am I misunderstanding?
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