Originally Posted by Injuneer

Check the fuel pressure. Your symptoms are typical of the fuel pressure bleeding off too quickly after the pump primes and shuts down. If that's what is happening, could be a faulty check valve in the fuel pump, faulty fuel pressure regulator, leaking injectors or leaking fuel lines, including those inside the tank.

Turn the key to "on" several times, rapidly. See if it starts faster after doing that.