I saw that you sprayed starting fluid and it started.
A flooding carb will not respond to starting fluid, that will only make it worse.
If you kept spraying the starting fluid, would it keep running?
If so, that is lack of fuel, not flooding. Many times an engine that is starving for fuel will cough back out the carb, and it may spit some gas back, not necessarily meaning it is flooding.
A flooding carb will display black stinky exhaust, run better at wide open throttle, load up and die at idle, overflow and drip gas, poor fuel economy, black foul plugs, will even raise the oil level if ran long enough.
A lean carb will sometimes idle, but not take throttle, cough back, no exhaust smoke.
To answer your question, no a mechanical pump can not make too much pressure.
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