A technique that is usable with a fuel cell stack includes providing an ejector to combine a first fuel flow from a fuel source with an anode exhaust flow from a fuel cell stack to produce a second fuel flow to an anode inlet plenum of the fuel cell stack. The technique includes regulating communication of the first flow to the ejector based on a pressure of gas in the anode inlet plenum.
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 The U.S. Government has a paid-up license in this invention and the right in limited circumstances to require the patent owner to license others on reasonable terms as provided for by the terms of Contract No. DE-SC02-03CH11137 awarded by the Department of Energy.