I have the same issue with my car, and I firmly believe it to be the carb. If I corner at a certain lateral load I can make the car shut off like a light switch. However in my case it’s an old Carter.
If the fuel pump is failing it would not occur at the exact second of max side loading. If the fuel pump fails there is still a fair amount of fuel in the float bowl, and when cornering you are typically at low throttle so fuel is getting sucked out of the float bowl at a relatively low rate. The fuel is there in the carb, but not in the spot where the pickup is trying to suck it into the motor.
I’m currently finishing up my Holley carb and while it’s still off the car I’ll be adding jet extensions and a road race float to the primary side of the carb.
Time will tell how it works, it can’t be worse.
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