F100 CAPT LEARNED AFTER THE FLT THAT COMPANY MAINT HAD GIVEN HIM WRONG ADVISE ABOUT THE CTR FUEL TANK VALVE BEING NORMAL WHEN STUCK IN THE CLOSED POS.

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EARLIER MAINT IN XXX HAD FIXED A CTR TANK VALVE THAT WAS STUCK OPEN. DURING FUELING IN YYY; I WAS TOLD BY MAINT THAT THAT VALVE DID NOT WANT TO OPEN. A CTR TANK VALVE STUCK CLOSED IS DEFERRABLE PER MEL SO I REVIEWED THE FUEL REQUIREMENTS WITH DISPATCH AND ACCEPTED A NEW RELEASE FOR 17000 LBS AND NO FUEL IN CTR TANKS. UPON RETURN TO COCKPIT AND E6 REVIEW; I NOTICED THAT YYY MAINT HAD VOIDED THEIR OWN CTR TANK WRITE-UP INSTEAD OF DEFERRING IT. WHEN I ASKED FOR AN EXPLANATION; HE TOLD ME THAT NAME #1 DELETED AT ZZZ HAD TOLD HIM THAT THERE WAS NOTHING WRONG WITH THAT VALVE AND THAT IT WAS PART OF A NORMAL OPERATING SYS THAT KEEPS A CTR TANK VALVE FROM OPENING WITH TOPPED OFF WING TANKS. I CALLED ZZZ AND WAS TOLD BY NAME #2 DELETED THAT THIS DIAGNOSIS WAS CORRECT AND THAT THE VALVE WAS ACTING BY DESIGN TO PROTECT FUEL TANKS FROM SOME TYPE OF OVERFLOW. I ACCEPTED THIS EXPLANATION BECAUSE I DID NOT SEE A REASON FOR ANYONE TO LIE ABOUT THIS SINCE THE ITEM COULD OTHERWISE HAVE BEEN EASILY DEFERRED PER MEL AND ZZZ ARE THE EXPERTS. THE NEXT DAY; I DECIDED OUT OF CURIOSITY TO TRACK ANY SUBSEQUENT MAINT WRITE-UPS ON 2BB. FLT ABC AGAIN HAD THE CTR TANK VALVE NOT OPENING AND ZZZ HAS DECIDED TO REPLACE THE VALVE; A DECISION MADE BY THE SAME PERSON NAME #2 DELETED WHO A DAY EARLIER ASSURED ME THE VALVE WAS FUNCTIONING AS DESIGNED. I FEEL THAT MAINT AND ENGINEERING DUPED ME INTO TAKING THIS ACFT.