Runs for 20 seconds then dies

Tryreplacing tfuel pump or at least have the PSI checked. a failing fuel pump will get worse and worse until dead. What happens is when the pump heats up it stars putting out less and less fuel until it starts to sputter and then die. When it cools off it runs fine again until it heats up again. Fuel cools the pump so make sure you have half a tank on hot days but sounds like it finally just gave out.

Best luck

Joe

Check the fuel pump, make sure it is putting out proper pressure if not then change the fuel pump