350 small block

[boloboss]

What's up Chevy family????
My 84 Chevy C10 has a 350 small block with a Edelbrock carburetor. It used to crank right up when I turned the ignition and now I'm having to tap the gas a few times before it start and sometimes more than that. But then once it gets going I can turn the truck off, turn the ignition and it starts right up and it will continue to start up consistently.. But then I'll let truck sit for a while, and the same scenario happens again Why am I having this problem?

 

[Chris64]

Electric choke, electronic choke or manual choke? I don't know much about how to fix it but I bet this will be a factor in diagnosing it.

Electric choke is supposed to squirt gas in there when the ignition is turned on I think. Maybe that's not working.

I was going to get an Edelbrock AVS2 with electric choke so I'm interested in hearing what others think the problem might be.

 

[Grit dog]

Accelerator pump. Easy to replace. 1 pump cold starts again.

 

[boloboss]

What and where is the accelerator pump? @Grit dog

 

[75gmck25]

For a carbureted engine, it sounds like it works as designed.

- on a cold engine the choke closes a flap in the carburetor to reduce (or choke) air flow and make the mixture richer. As the engine warms up, the choke slowly opens to allow more air, and finally opens completely.
Older engines used a choke with a thermostatic flap controlled by hot air, which eventually transitioned to using one controlled by electric power. A few chokes are also cable controlled, but they are not common on a squarebody.

- when you pump the accelerator pedal, the accelerator pump in the carburetor squirts additional fuel into the carburetor. This provides more fuel to get a cold engine to fire, or to provide more fuel when you quickly accelerate. The pump has a rubber seal in a small cylinder, which can tear, stick in the bore, or otherwise wear or malfunction.

Chokes are easy to adjust, and an accelerator pump is relatively easy adjust or replace (carburetor top has to come off to replace it).