hey everyone. I have a 75 f250 with a new 460 edelbrock performer intake and new holley 4160 600cfm vacuum advance with electric choke. I have noticed when it is cold i just hit the petal once and it fires right up and about 20 seconds later i tap the pedal and iddle drops like it is supposed to. when I go for a quik run to get gas or groceries it fires right up with out even touching the pedal. it is when i leave the truck for a half hour or so after driving that it takes more pumping of the gas to get to fire up. could there be gas driping through the carb or something? it even smells like gas after about 30-60min after a drive. I have checked all lines from the fuel pump up and all is new and no sign of leakage. is there some linkage or something that might be driping the fuel down the carb or something. thanks for any input.

 

it's possible that after a long enough drive to where the intake etc is fully heated up that the gas in the fuel bowls can actually expand enough from the heat and spill over into the intake and cause a small flooding issue. It happens on my brothers 383.

I guess I wouldn't worry about it a whole lot.

 

Is your carb bolted directly to the intake? if so it may be transferring heat to the carb and boiling the fuel off after you shut down requiring excessive pumping of the accelerator upon re-start, a phelonic carb spacer will prevent this if that is your issue, does it act as if it's flooded after this given scenario? or just seem like a lack of fuel to the carb? if you hold the accelerator to the floor will it fire right up? or do you need to pump it repeatedly? are you using an evaporative gas cap? if not it may be creating a vacuum effect after shut down and sucking your fuel back into the tank.

 

Try "Montana's" suggestion. Mine used to do pretty much the same thing. My carb used to get pretty hot after driving for a while. The spacer fixed the problem.

 

Let me clear up a lot of misconceptions about starting a carbureted vehicle. There should be no pumping of the gas to get the vehicle started. What happens is people try to start it incorrectly the first time, then figure the proper solution is to pump the pedal, which just floods the engine.

I will say it now: Pumping the pedal repeatedly is unnecessary. There are a lot of people that think you're "priming the carburetor." No.

Here is the proper way to start a carbureted vehicle:

Cold start: Push the pedal once to the floor and let up. That's it. This is not to "prime" the carburetor. It's to open the throttle so that the fast idle cam is released, which lets the choke snap shut.

Warm start: Gently press the pedal in about 1/4 of the way, hold it there, turn the key, then let go of the pedal at the same time you let go of the key. Again, this is not to prime the carbuertor; in this case it's to open up the throat of the carburetor to allow a larger volume of air\fuel for combustion.

Pressing the pedal once does not "prime" the carburetor as it only discharges fuel against the venturis; which essentially affects the fuel bowl very little. The only time it makes sense to press the pedal any more than what I've mentioned above is for very cold temperatures when it helps to get the throttle plates slightly wet, which provides a slightly more rich firing mixture. But it's June, and unless you live in Antarctica, no one should be doing that right now.

Anything other than what I have described will flood the motor very easily. As to your original question, your method of starting the motor could be the problem. If you revert to the correct method and still have problems, try MH's suggestion. The reason I brought all this up is because after it takes you several pedal pumps to start the truck, you're not fighting the original problem; you're fighting a flooding situation which you created.

This explanation is incorrect, and this issue should not happen. If this happens, you have a float height issue.