What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: FORWARD AND AFT FUEL PRESSURE LIGHT ILLUMINATED ABOUT 18000FT. CLIMBING THROUGH 22000FT FUEL MASTER CAUTION CAME ON AND BOTH FUEL PRESSURE LIGHT ILLUMINATED ON THE LEFT ENGINE. WE NOTICED FUEL CONSUMPTION WAS GREATER ON THE NUMBER 1 ENGINE SO WE SUSPECTED FUEL LEAK. AIRCRAFT AIR INTERRUPTED BACK TO AND LANDED SAFELY AT AUS. PERFORMED EXTERNAL WALK AROUND FOUND NO EXTERNAL LEAKS. REMOVED AND REPLACED FUEL SYSTEM MODULE, PER AMM 28-22-43. PERFORMED OPS CHECK GOOD. ALSO PERFORMED NR 1 AND 2 ENGINE IDLE RUN. PER AMM 71-00-00 OPS CHECK GOOD NO LEAKS NOTED.