ACR LGT DEP BLOCKS WITHOUT THE CORRECT FUEL LOAD. ACI WAS OBSERVING AND ACFT RETURNED TO BLOCKS FOR MORE FUEL.

Narrative

WHILE DOING OUR CHKLIST; ETC FOR OUR FLT ORD-PHX; DISCOVERED TKOF WT HAD GONE FROM 159.0 ON FIRST FP TO 173.595 ON WT MANIFEST; AND FUEL HAD BEEN INCREASED TO 43.0. FAA INSPECTOR RIDING JUMP SEAT CHKED WITH OPS AND A SECOND FP WAS HASTILY DELIVERED TO COCKPIT AFTER SCHEDULED DEP TIME. A CHK WAS MADE OF THE TKOF WT AND A PUSH BACK WAS STARTED. AT THE SAME TIME I NOTED; THE FUEL HAD GONE TO 45.1 ON THE NEW FP. COMPARING THE NEW FUEL BURN OFF FOR FUEL WITH THE FUEL WE HAD ON BOARD I REASONED THAT PER OUR FLT OPS MANUAL WE COULD USE PART OF OUR HOLD FUEL AS CONTINGENCY FUEL TO 2/0 HRS AND NOT COMPROMISE SAFETY. TFC WAS LIGHT AT ORD AND WX WAS VFR AT PHX WITH NO ALTERNATE ON FLT PLAN. SOME ISOLATED TSTMS BEING IN THE GENERAL AREA. ABOUT THE TIME ENGS WERE STARTED; OPS ADVISED US TO RETURN FOR MORE FUEL; WHICH WE DID. EXPLAINED SITUATION TO FAA INSPECTOR; ADVISED HE WOULD BE SENDING A RPT ABOUT WHAT TOOK PLACE. IN PHX SO ADVISED ME INSPECTOR HAD MADE DEROGATORY REMARK IN FRONT OF PAXS ALSO; HE HAD LEFT COCKPIT WITHOUT ADVISING ANYONE AND WAS READING A MAGAZINE ENRTE.