DC10 FLC HAS LOSS OF WING ANTI-ICING CAPABILITIES RESULTING IN A DIVERT AND A LOW FUEL EMER.

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DSNDING THROUGH 8000 FT FOR LNDG AT LCK; IN OVCST AND ICING CONDITIONS. HAD INDICATION OF #3 PNEUMATIC MANIFOLD FAILURE. COMPLETED CHKLISTS FOR THAT CONDITION; WHICH RESULTED IN LOSS OF ANTI-ICE FOR R WING AND UPPER ANTENNA. CEILING AND TEMP AT LCK WERE 700 FT OVCST AND 1 DEG C. I ELECTED NOT TO LAND THERE; AND CLBED BACK OUT OF ICING CONDITIONS. THIS ACFT IS NOT EQUIPPED WITH ACARS OR INS; SO HAD TO CONTACT COMPANY DISPATCHER TO SEARCH FOR AN ARPT WITH BETTER WX. THERE WERE NO ARPTS IN THE REGION THAT WERE CLR. COMPANY OFFERED 3 ARPTS WITH BEST WX; AND I CHOSE TO RETURN TO MEMPHIS; BECAUSE OF THE DISTANCE AND THE FACT THAT I KNEW WE COULD STAY OUT OF THE CLOUDS UNTIL 10000 FT. WE WOULD LAND; HOWEVER; WITH LESS THAN THE NORMAL MINIMUM FUEL. I INFORMED ATC THAT WE NEEDED PREFERENTIAL HANDLING AND A DIRECT HDG FOR MEMPHIS. THEY SAID THEY COULD NOT DO THAT. SO; I THEN DECLARED AN EMER FOR LOW FUEL; BECAUSE WE COULD NOT TAKE ANY DELAYS. WE THEN RECEIVED A DIRECT HDG FOR MEMPHIS; AND I ALSO REQUESTED A TURN ONTO THE LOC AT 30 MI OUT FOR A STRAIGHT IN APCH TO THE NEAREST RWY. UPON LNDG; WE HAD ONLY 1400 LBS OF FUEL ABOVE EMER FUEL LEVEL. I WAS VERY GLAD I DECLARED THE EMER. WE COULD NOT HAVE TAKEN ANY DELAYS. IT ALSO WOULD HAVE BEEN EXTREMELY HELPFUL TO HAVE HAD ACARS; BECAUSE IT BURNED UP VALUABLE TIME AND FUEL WAITING FOR THE COMPANY TO FIND US A BETTER ARPT. WE COULD HAVE DONE IT MUCH FASTER OURSELVES.