It is very much easier to check for voltage to the intank pump first. Just unplug the pump connection where it exits the gas tank. One wire is the hot wire to the pump and the other (obviously because it is grounded to the chassis) is the ground. Have someone crank the engine while you check for voltage with a test light or voltmeter. If voltage is present (3-5 seconds) then the problem is in the tank pump or tank wiring. If no voltage is present then the problem is in the pump circuit (relay etc.).
Have you checked the fuse for the intank pump? It is fused after the relay. The main pump fuse controls both pumps while the intank pump is fused secondarily after the relay. Hence it is possible for the fuel pump relay and main pump to operate while the intank pump sits idle with a blown fuse.
Also you need to check for voltage (hot with the ignition switch on) on the supply wire to the pump relay. The supply wire is Orange with red stripe.
If none of these proves to be the problem, then run a hot wire from the battery to the rear of the car (I always just go outside the car with the wire) and touch it to the pump motor lead (brown wire I think). If the pump runs then the problem is with the chassis wiring or the relay. If it doesn't, bad pump or pump wiring.