The last time I did a flight with the C-130 in FSX/P3D, I had no problems with the way fuel was delivered to the engines. I used the the fuel tank settings I showed in the image. If I have used less than 100% fuel, I deliberately leave certain tanks empty, and for the empty tanks I always turn of the fuel pumps and close the fuel valves for those tanks. It has been quite a few years since I did a really long flight in the C-130, and without any updates since then, I assume it would still work fine. As long as the fuel can be fed to all the engines from the tanks with fuel, there shouldn't be a problem with the engines shutting down during flight.