Merlin cuts out and will not refire.

[Voyager]

Originally Posted by smokincrater

Speaking a as motor mechanic the engine should refire after the float level rights itself while postive G is restored and the correct mixture restored. 250 rpm should be fast enough to restart a warm engine. 250 rpm is easliy gained be putting the stick down and wind milling the propeller. Pilots had engines stop on them this way and restarted them this way.

Just to throw out a cross reference for that:
Pelican's Perch #7: Run That Fuel Tank Dry!

A specific FAA regulation he cites in the article is:

FAR 23.955(e) Multiple fuel tanks. For reciprocating engines that are supplied with fuel from more than one tank, if engine power loss becomes apparent due to fuel depletion from the tank selected, it must be possible after switching to any full tank, in level flight, to obtain 75 percent maximum continuous power on that engine in not more than -
(1) 10 seconds for naturally aspirated single engine airplanes;
(2) 20 seconds for turbocharged single engine airplanes, provided that 75 percent maximum continuous naturally aspirated power is regained within 10 seconds; or
(3) 20 seconds for multiengine airplanes.

FAR 25.951(a) Each fuel system must be constructed and arranged to ensure a flow of fuel at a rate and pressure established for proper engine and auxiliary power unit functioning under each likely operating condition, including any maneuver for which certification is requested and during which the engine or auxiliary power unit is permitted to be in operation.
(b) Each fuel system must be arranged so that any air which is introduced into the system will not result in -
(1) Power interruption for more than 20 seconds for reciprocating engines; or
(2) Flameout for turbine engines.