Posted by Steve@Advance on December 22, 2018 at 07:45:02 from (66.169.147.211):
In Reply to: Re: Petrol problems... posted by Russ from MN on December 22, 2018 at 07:01:26:
Russ, not necessarily so...
If you look at a flow circuit diagram of a carb, you'll see that there is a bowl vent tube that extends out beyond the choke plate. What that tube does is equalize the atmospheric pressure on the fuel in the bowl with the pressure inside the air filter.
Closing the choke reduces the air flow behind the plate but leaves the vent open, therefore causing the intake vacuum to draw directly from the main jet, giving a full rich mixture.
Once the choke is opened, the pressures equalize and the carb returns to normal idle mix/ventura draw regardless of the air filter restriction, up to a point...
If the air filter becomes so clogged it can't move enough air across the ventura, then the siphon effect is reduced to the point little fuel can be drawn up from the bowl.
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