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 High Vacuum flooding carb? 
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Joined: Thu Jun 20, 2013 9:28 am
Posts: 121
If i have a choke on one carb in a 2 carb setup the carb i have the choke on will dribble fuel out the throttle shafts if i run the vehicle for 30 seconds or so - with partial choke - and then shut the engine off. If i warm the engine and get off the choke and shut the engine off the carb will stay dry.
If i have 6 holley 94's and the engine idling and place my hand on top of one carb my hand will get wet from raw fuel. In this case my hand is acting like the blade of the choke as described above.
Any thoughts or comments?

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Carter carburetor parts and restoration


Mon Oct 28, 2013 4:35 pm
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Joined: Fri Feb 08, 2013 2:37 pm
Posts: 1701
The closed choke causes flow from the main nozzle at much lower RPM than occurs on a warm engine with the choke open. This wets the throttle plates and shaft so when the engine is shut off the fuel wicks out the shaft clearance. The liquid fuel moves through the shaft clearance by capillary action. No different than when the nozzle drips because the float level is too high. When the engine is running the vacuum pulls air through the throttle shaft clearance and that keeps the fuel inside the bore.


Mon Nov 04, 2013 2:29 pm
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