I would just cycle the key. Its a return type system. And it should not take too many cycles. The pumps, by design, run for a short period when you turn the key to prime the system. If the car does not actually fire up, they turn off. This is incase of an accident - no engine running, no fuel.

I have worked on a few engines that were depleted of fuel. In all cases just a few turns of the key would be enough to get fuel pressure back up. They were all return type systems.

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1991 560 SEL / 185k miles
1992 750il / 17k miles - project car