AN L1011 IN CRUISE AT FL370 DECLARED AN EMER DUE TO #1 TANK BOOST PUMPS NOT FEEDING FUEL TO ENGS CAUSED BY OPEN REMOTE CTL CIRCUIT BREAKERS.

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I WAS THE CAPT OF ACR FLT XXX; ABC-ZZZ; JUN/XA/00. WE DEPARTED ABC; US; 3 HRS LATE DUE TO AN UNRELATED MECHANICAL PROB. ABOUT 40 MINS OUT OF ZZZ ON THE 4 HR 31 MIN PLANNED FLT; WE DISCOVERED THAT #1 FUEL TANK HAD STOPPED FEEDING FUEL TO THE ENG AT 18600 LBS. TOTAL FUEL REMAINING WAS ABOUT 37000 LBS. AFTER CALCULATING FUEL BURN; TIME REMAINING; ETC; I DECLARED A FUEL EMER WITH ZZZ CTR AND WE WERE GIVEN A DIRECT ROUTING TO ZZZ. WE LANDED UNEVENTFULLY WITH 28000 LBS OF FUEL; 18600 LBS UNUSABLE AS FAR AS WE KNEW AT THE TIME. WE ALSO HAD A FUEL IMBAL WING-TO-WING OF ABOUT 13000 LBS; BUT WE HAD AMPLE LATERAL CTLABILITY. WE LATER FOUND OUT FROM MAINT THAT THE #1 TANK BOOST PUMPS WERE WEAK AND A REMOTE CIRCUIT BREAKER WAS FAULTY IN THAT WING. THE FUEL SIT NEVER REACHED A CRITICAL POINT WITH THE EXPEDITIOUS HANDLING WE RECEIVED; HOWEVER; I FEEL JUSTIFIED WITH DECLARING AN EMER. HAD WE ENCOUNTERED ANY DELAYS OR TFC PROBS WE WOULD HAVE BEEN IN TROUBLE. WE LANDED WITH 10000 LBS OF USABLE FUEL; 1000 LBS BELOW OUR MINIMUM RESERVE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE PROB WITH THE BOOST PUMPS WAS CAUSED BY 1 OR MORE REMOTE CTL CIRCUIT BREAKERS OPENING UP AND REMOVING PWR FROM THE PUMPS. THE RPTR SAID THE PWR TO THE BOOST PUMP LOW PRESSURE WARNING LIGHTS WAS ALSO INTERRUPTED. THE RPTR SAID THE PUMPS MAY HAVE LOST 1 OR MORE PHASES AND RAN SLOWLY IF AT ALL. THE RPTR STATED THE FUEL IMBAL WAS MANAGEABLE AT ALL TIMES. THE RPTR SAID THE SMALL COCKPIT CIRCUIT BREAKER THAT INDICATES TRIPPING OF THE REMOTE CTL CIRCUIT BREAKER DID NOT INDICATE ANY REMOTE CTL BREAKER OPEN PHASES OR FAILURE.