Older model troy bilt 17 half horse briggs stratton .
Starts fine and runs fine for about 15 minutes and the engine dies and will start right back up and dies as soon as you let off the switch.
Have installed fuel filter air filter new spark plug and cleaned the carb.
What could be the problem.
Thank you

Hi,
It would help to know what model engine, but it sounds suspiciously like a fuel pump or switch. Sounds a bit like either though the fuel pump, if equipped, could be falling behind. The cranks and dies part sounds like it could be either. Hard to make a real good guess without the engine or machine info.
Is a little bit short for ignition, though not much.
Peace,
Clarke