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Re: Trying to figure this out about carburetors. Fuel from acc pump at start up..........

October 8 2017 at 3:52 PM
Drew Pojedinec  (Login DeepRoots78)
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Response to Trying to figure this out about carburetors. Fuel from acc pump at start up..........

The fuel sits on the floor of the intake and evaporates into the oncoming air stream.
Fuel doesn't really leak into the cylinders so much. Heck even when running a good bit of fuel is simply sliding around on the intake floor, kinda oscillating in the pulses.

Cranking, the engine isn't producing enough of a signal to the idle circuit of the carburetor to properly pull the fuel mixture, yes it gets some, but a cold engine needs to be pretty rich in order to fire.
Same reason you have a choke plate, the air restriction under it causes a greater signal, thus it pulls fuel more easily.

Due to the design, certain carburetors are easier to start cold than others.
I consider the Autolite carburetors to be pretty much the easiest to start, seems I can leave one for 6 months, crank it up and the dang thing is running.

 
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