53 F100 Flathead V8 239 not starting help

[JSeery]

Opening and closing the throttle doesn't control the fuel flow, it controls the air flow. Fuel is metered in proportion to the amount of air flowing through the carburetor ventures. It appears to only run when the air flow is high enough to match the fuel being supplied. If it is getting to much fuel, it could be the float needle valve sticking open or some internal carb leak.