B737 SUFFERS FLAMEOUT OF R ENG DUE TO FAILED FUEL XFEED VALVE.

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#2 ENG FLAMED OUT AT FL370. EMER WAS DECLARED TO FACILITATE DSCNT. SUCCESSFUL RESTART AT FL220. EMER TERMINATED. ASKED COMPANY OPS VIA ACARS IF THEY WANTED US TO CONTINUE TO DEST (ZZZ1) OR DIVERT TO ZZZ; WHICH WAS THEN ONLY 75 NM AHEAD. THEY RESPONDED TO DIVERT TO ZZZ. WE DID. CHANGED ACFT IN ZZZ AND CONTINUED TO ZZZ1. AT TIME OF FLAMEOUT; WE HAD BEEN LEVEL AT FL370 APPROX 1 MIN. I HAD BEEN XFEEDING FUEL FROM THE L TANK TO THE R ENG DUE TO A 600 LB IMBAL FOR ABOUT 2 MINS. AFTER LNDG IN ZZZ; WE FOUND THE CIRCUIT BREAKER FOR THE FUEL XFEED VALVE OPEN. THIS CIRCUIT BREAKER IS LOCATED BEHIND THE FO'S SEAT BACK AT THE PRECISE LEVEL OF THE SHOULDER HARNESS INERTIAL REEL. IT IS A FAIRLY COMMON OCCURRENCE IN THE B737 TO HAVE CIRCUIT BREAKERS IN THIS AREA PULLED OUT BY THE METAL TIPS OF THE FO'S SHOULDER HARNESSES WHEN HE RELEASES THEM AFTER TKOF. THERE IS ALSO THE LIKELIHOOD THAT I FAILED TO VISUALLY CHK THE XFEED VALVE OPENING (DARK BLUE LIGHT TO LIGHT BLUE LIGHT) PRIOR TO TURNING OFF THE #2 TANK BOOST PUMPS. I HAVE BEEN XFEEDING FUEL FOR MANY YRS WITH NEVER A PROB; BUT HUMANS DO MAKE ERRORS. WHILE THIS SCENARIO IS NOT NECESSARILY A PROBABILITY; IT MUST BE CONSIDERED AS A POSSIBILITY. IN CLOSING; I WOULD LIKE TO SUGGEST SOME TYPE OF SHIELD; APPROX 12 INCHES WIDE AND 6 INCHES TALL; AS REQUIRED; BE INSTALLED BEHIND THE FO'S INERTIAL REEL TO PREVENT THIS TYPE OF PROB.