Quote:
Originally Posted by Oldsmaniac
The engine is what is backfire-ing and not the carb. The engine can backfire thru the carb or thru the exhaust/muffler. I have found that most backfire is caused by an ignition problem. Check the fireing order to make sure a plug wire is not reversed. Make sure plug wires are good. Look inside the distributer and at cap and rotor. Check for cracks or carbon tracking. Also check to see that harmonic balancer has not slipped and that timing is corrrect. These are things to check if you have not done so already.
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Great advice, I totally agree it is probably igniton parts/timing related. I would be courious to verify fuel flow. You could do that by removing the fuel line after the pump and verify its ability to fill a container in short time.