C175 GLIDER TOW PLANE RAN OUT OF FUEL DURING GLIDER TOW AND WAS FORCED TO LAND OFF FIELD RESULTING IN NO DAMAGE TO THE ACFT OR PROPERTY.

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DURING PREFLT; I DIPSTICKED BOTH FUEL TANKS. STICK INDICATED APPROX 10 GALLONS EACH TANK. ON CHKING THE FUEL GAUGES; THE R GAUGE SHOWED NEAR EMPTY AND THE L GAUGE SHOWED APPROX 1/2. THE MISSION WAS TO TOW CLUB SAIL PLANES. LGC ARPT MGMNT WOULD NOT ALLOW LCL TRAINING FLTS DURING A WKDAY; EVEN THOUGH IT WAS A HOLIDAY; SO THE PLAN WAS TO LAUNCH THE SAIL PLANES; HAVE THEM FLY TO PIM ARPT; AND TRAIN THERE. THE DENSITY ALT WAS APPROX 2400 FT. THE FIRST TOW WAS AN L23 WITH 2 ABOARD. MINIMUM LIFT WAS OBSERVED DURING THE TOW; SO THAT FLT CONTINUED A PWRED CLB TO APPROX 4000 FT TO LESS THAN 5 MI FROM PIM WHEN THE GLIDER DROPPED OFF TOW. I RETURNED FOR A SECOND TOW OF A K6. THE TOW WENT TO 3500 FT APPROX 7 MI SE OF LGC. I RETURNED TO LGC FOR A THIRD TOW OF ANOTHER K6. THE TOW CONTINUED AS A PWRED CLB TO OVER 4200 FT TO LESS THAN 2 MI FROM PIM WHEN THE GLIDER DROPPED OFF TOW. THE CONTINUING PWRED CLB WAS PERFORMED TO GIVE THE GLIDER THE MAX WORKING ALT AND MAINTAIN A SAFE SLOW TOW SPD. UPON DROPPING THE K6 OVER PIM; I RECEIVED A CALL ASKING ME TO LAND AT PIM AND TOW THE L23 OFF FOR A PATTERN FLT. I INFORMED THE L23 PLT THAT I WOULD NEED TO REFUEL AFTER THAT TOW. I TOWED THE L23 OFF RWY 27 AND PROCEEDED NW WHILE CLBING. THE L23 DROPPED OFF TOW AT APPROX 2900 FT AND I PROCEEDED ON COURSE TOWARD LGC. WHILE CRUISING AT APPROX 3200 FT; 9 MI NW OF PIM; I EXPERIENCED AN ENG STOPPAGE. ALL INSTS WERE IN THE GREEN EXCEPT FUEL PRESSURE. THE R GAUGE STILL SHOWED NEAR ZERO AND THE L GAUGE SHOWED BTWN 0 AND 1/4. I SWITCHED THE FUEL SELECTOR TO THE L TANK AND THEN THE R TANK; AND STILL COULDN'T GET FUEL. DURING THAT TIME; I LOOKED FOR ALTERNATE LNDG FIELDS. I TURNED E AND HEADED TOWARD A SOD FARM THAT HAS A PVT STRIP WHILE SEARCHING OTHER SITES. I SELECTED 7700 ON THE XPONDER. I CALLED MAYDAY ON THE FREQ THAT I WAS ON (122.8 THE PIM UNICOM FREQ). I THEN CHANGED TO 121.5 AND REPEATED THE MAYDAY CALL WITH MY POS. WHEN IT BECAME OBVIOUS THAT I WOULD NOT BE ABLE TO GLIDE TO THE SOD FARM STRIP; I SET UP AN APCH TO A FARM FIELD THAT I HAD IDENTED AS AN ALTERNATE SITE. I LANDED UP HILL IN THE FIELD AND STOPPED IN 300-400 FT. THERE WAS NO DAMAGE TO THE ACFT OR PROPERTY; AND NO INJURIES TO MYSELF OR ANYONE ELSE. I RECEIVED A CALL FROM ONE OF THE GLIDERS THAT I HAD TOWED AND ANSWERED HIM ON MY HANDHELD RADIO. THE FREQ WAS CONGESTED AND WE SWITCHED TO ANOTHER. I GAVE HIM A RPT OF MY LOCATION AND CONDITION; WHICH HE REPLIED TO THE OTHER ACFT. I NEXT CALLED 911. I GAVE THEM MY INFO AND ASKED THEM TO CALL THE FAA. THE HARRIS COUNTY 911 CTR ANSWERED THE CALL AND AID THAT I WAS IN TROUP COUNTY. I ALSO TOLD THEM THAT THERE WAS NO EMER AND ASKED THAT TO CALL ANY RESPONDING SVCS TO REDUCE THE CHANCES OF A HIGH SPD VEHICLE ACCIDENT. THEY REPLIED THAT THEY WOULD INFORM TROUP COUNTY EMER SVCS. I CALLED ONE OF OUR A&P'S ON MY CELL PHONE. HE DROVE TO THE LNDG SITE. WE DETERMINED THAT I HAD EXPERIENCED FUEL EXHAUSTION AND THAT THE ACFT HAD NOT BEEN DAMAGED.