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I still wonder if there is enough gravity feed pressure to allow the car to run even if the lift pump was not working?
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Well, speaking from my first fuel filter change experience, I think the answer is yes. I missed the pre-filter O-ring and the lift pump was sucking in air so the only way for me to get the system to run was to fill the spin on filter right to the top with fuel. It gave me about 5 minutes of idling time - just enough to diagnose the stream bubbles entering the system at this point. The lift pump may have been filling the spin-on filter with air and this pressure was enough to keep the system briefly running, but I'd bet that even if the lift pump was disconnected the engine would have started.