Crank and start, crank and shut down(3 sec) crank and no start

[Camibox]

Same symptoms over the last few attempts. Cranks and runs fine 5 to 10 min then we shut it down. try to start a few seconds later and it starts and dies about 3 seconds later. Third attempt is then crank but no start. No CEL codes. fuel tank at 1/2. I have replaced the fuel pump relay. When I jumper the relay I can hear the pump running. This same sequence happened 3-4 times already with a 10-30 minute wait between each test.
Help Please