Not getting enough fuel to idle

Ran perfectly and added no gas. No one touched engine. Next day, starts and shuts off in two seconds. If I throttle very rapidly can make idle about ten to fifteen seconds but still shuts off. Checked all fuses and relays and drained remaining four gallons has and added cleaner to high octane gas. Still shuts off in two seconds.

I would also like to add that my average or maybe above average mechanic friend checked fuel filter and fuel pump and found okay.
However, could it be other fuel. Pump inside tank is bad and the cause? Seems though to me, like it should not just run perfect and than the next day,
stop idling after only two seconds continuously.
Tia. Thanks!