I have a 1984 Z28 camaro with 305. After my car sits for 8 hours or more it cranks forever before firing. Before I crank the car I pump the gas pedal three times to close the choke and to fill the carb with fuel. It dosenot matter how many times I pump the gas peadal after it sits for a long period of time it just cranks over way to much before firing. I dont think I am losing any fuel out of the carb after sitting for a while because I have a new carb on the car. When I first crank the car it starts for a second and then dies. I then pump the gas pedal 3 more times and hold the gas pedal down and then it will usually fires up. I dont want to burn up the starter or hurt the flywheel. I have installed a new carb, rotor, cap, plugs, wires, and ignition timing is correct. Does anybody have any ideas????? Could the evap system have something to do with my problem???

 

If you pump the gas 3 times, you've flooded it. Then you hold the gas pedal to the floor and crank it over to clear it's throat. Stop doing that.

One tap of the gas to engage the choke is all you need.

If there is no fuel in the bowl, then you've got leaking well plugs, but with a new carb, I doubt that's the case. Just one tap of the gas should be fine.

 

It dosent matter how many times I pump the pedal I still have the same issue and I know the carb is not leaking because weather is was the old or new carb on the car I still had the same problem.

 

Your choke isn't adjusted right.
Search under my name for choke adjustments. You'll want to set the fast idle, and probably most importantly the screw on the back of the vacuum break, that sets how far open the choke blades go when you cold start it.

 

Well after reading your article I adjusted my choke and it helped. Instead of it taking about 4 sets of cranking before firing it takes two now and thats with just one pump of the accelerator before cranking. I will try 3 pumps next time before firing to see if that helps any. I really aprreciate your help.

 

I wouldn't settle for anything less than perfection. It should start up with one pump halfway to the floor to set the choke, and a flick of the starter.
You may need to rebuild the carb, as the acc pump shaft might be leaking, or the choke thermostat might need replacing.
But before that, what did you adjust exactly?

-Fast idle speed should be ~1200RPM when the engine is cold (cold idle screw)

-Choke thermostat should be turned such that the choke blades are *just* shut when the engine is cold

-Vacuum break should be set so that it pulls open the choke blades to ~1/8"-3/16" when it opens, when the engine is cold.

 

My choke blades were set perfectly before but my fast idle was not set (not engaging). I adjusted the fast idle so when the choke blades shut the fast idle would engage. The fast idle is around 1600 rpm (chilton manual prefers 2200rpm). A guy at work actually was thinking that my acc. pump was leaking. Its funny because after I let it sit for 8 1/2 hours I pumped the gas pedal three times and it fired right up, absoulutly no problems. If I pump the pedal once the car will not fire unless I pump the gas pedal more than once.