Re: Partner shut off key on overnight run now engine won't run...
Air entry in fuel pickup system? No cracks, loose clamps, fossilized gaskets? Can you see small air bubbles being sucked into the fuel filter?
Does fuel system require a re-bleed after 30 seconds of running? Does any air come out of fuel system after it shuts down?
Had similar symptoms from a JD powered tow-behind air compressor. Could see air bubbles filling up filter, and it died after a very short run. Would restart, but sucked air back into system. Repeat until batt dies. Fixed by brazing crack closed in pickup tube.