Autolite 4300 carburetor bogs when accelerating | The De Tomaso Forums

stevebuchananMember

The car starts nicely and idles well. But it bogs badly when accelerating. I have a fresh Holley 600 carb and when it is swapped in the car accelerates correctly thus ruling out ignition issues, vacuum leaks, and low fuel pressure. I disassembled the 4300 this morning and thoroughly cleaned it although it looked good inside upon initial disassembly. The accelerator pump squirts fuel when the throttle is opened. The choke is set all the way to lean. I am not sure what to focus on at this point. Maybe the power valve is not working correctly?

It is the original carb for the car and I am trying to retain it.

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5/11/2012:58 PM

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stevebuchananMember

It looks like the accelerator pump cup had shrunk from sitting in our new, modern fuel. The pump was squirting but not enough fuel. With a new pump cup installed the Autolite 4300 is working about the same as the Holley 600.

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5/16/2011:18 AM

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