TM 55-1930-209-14&P-8 Table 31.  Fuel Oil System Valves Figure 34 Type Callout Location Valve Name and Function 1-in FO1 Void 3 starboard DAY TANK OVERFLOW TO PORT globe valve overhead in front of STORAGE TANK: Allows fuel to flow starboard storage tank from day tank overflow to port storage tank 1-in FO2 Void 3 starboard DAY TANK OVERFLOW TO STARBOARD globe valve overhead in front of STORAGE TANK: Allows fuel to flow starboard storage tank from day tank overflow to starboard tank 2 1/2-in FO3 Weatherdeck on STORAGE TANKS FILL: globe valve starboard side near Allows fuel to flow to valves fuel fill station FO4 and FO5 2 1/2-in F04 Deckhouse ROWPU STARBOARD STORAGE TANK FILL: globe valve space starboard side Allows starboard storage tank forward of day tank to be filled 2 1/2-in FO5 Deckhouse ROWPU PORT STORAGE TANK FILL: globe valve space starboard side Allows port storage tank to forward of day tank be filled 1-in F06 ROWPU space STARBOARD TO PORT STORAGE TANK globe valve starboard side TRANSFER: Allows fuel to be transferred from starboard to port storage tank 1-in FO7 ROWPU space PORT TO STARBOARD STORAGE TANK globe valve starboard side TRANSFER: Allows fuel to flow from port to starboard storage tank 1-in FO8 Void 3 starboard near PORT STORAGE TANK DISCHARGE: gate valve bottom of starboard from port storage tank into fuel storage tank day tank supply line and for isolating port storage tank 1-in FO9 Void 3 starboard in STARBOARD STORAGE TANK gate valve day tank fuel supply DISCHARGE: Allows fuels to be line near valves FO8 discharged from starboard tank and and FO10 for isolating starboard storage tank 1-in FO10 Void 3 starboard in day STORAGE TANKS DISCHARGE: Allows gate valve tank fuel supply line fuel to be discharged from valves FOB near valve F09 AND FO9 to transfer pump 3/4-in FO11 ROWPU space forward WORKBOAT SUPPLY: gate valve side of day tank Allows fuel to flow to valve FO12 on weatherdeck boat fill station 3/4-in FO12 Weatherdeck in boat BOAT FILL: Allows fuel to be supplied globe valve fill station to workboat 1-in FO13 ROWPU space below DAY TANK DRAIN TO STORAGE TANKS: gate valve day tank Allows fuel to be drained to storage tank 3/8-in FO14 ROWPU space below ROWPU1 DIESEL ENGINE SUPPLY: globe valve day tank Allows fuel to flow to valve FO26 at HP pump supply side 3/8-in FO15 ROWPU space below ROWPU2 DIESEL ENGINE SUPPLY: globe valve day tank Allows fuel to flow to valves FO27 at HP pump supply side 3-6