EMER LOW FUEL DUE TO POOR PLANNING.

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ON THAT FLT I HAD PLANNED TO USE 2200 LBS FUEL FOR A 2.1 HR FLT. WE BROUGHT THE PLANE UP TO 3000 LBS WITH 2900 LBS FOR TKOF. HEAD WINDS WERE FORECASTED AND THE FORECAST FOR PHX WAS CLR. THE TRIP WENT AS PLANNED UNTIL ABOUT 50 DME W OF IWA. WE WERE STILL WITH CTR WHEN THEY GAVE US HOLDING INSTRUCTIONS. THE HOLD HAD AN EFC OF ABOUT 25 MIN LATER. I TOLD CTR I COULD NOT ACCEPT THAT CLRNC DUE TO LOW FUEL. HE THEN GAVE ME A VECTOR AWAY FROM PHX. I THEN TOLD HIM I COULD NOT ACCEPT A CLRNC AWAY FROM THE ARPT AS MY FUEL WOULD BECOME A PROB. TO SAY THE LEAST HE SHOWED LITTLE INTEREST IN OUR PROB. AT THAT TIME I HAD LITTLE CHOICE BUT TO DECLARE AN EMER DUE TO POSSIBILITY OF LOW FUEL. WE WERE THEN TURNED OVER TO PHX APCH. THEY ASKED ME IF WE COULD FLY A NORMAL DOWNWIND 13 MI AND I CHKED OUR FUEL AND TOLD HIM IT WOULD BE OK. WE LANDED IN PHX ON RWY 26L AS PLANNED. WHEN I LEFT FAT I HAD PLANNED TO LAND AT PHX WITH 700 LBS RESERVE FUEL. I FELT THAT THE HOLDING CLRNC WOULD HAVE REDUCED MY RESERVE FUEL IN SUCH A WAY THAT IT WOULD BECOME AN UNSAFE SIT.