300D shut off during driving, won't start

[negativeions24]

I was driving my 81 D today and the engine shut off as I was starting an uphill. It had been been low on fuel, but shouldn't have run out. I got it towed home and put more fuel in the tank, as well as some fuel in the filters (they were not dry and quite full). After cranking it and cranking it, recharging the battery some more, and cranking some more, I still can't get the car to start.
I'm starting to think it's the fuel pump. If you have any words of wisdom, I'd really appreciate it. Thanks!