ARMY TM 9-6115-639-13 AIR FORCE TO 35C2-3-386-51 MARINE CORPS TM 10155A-13/1 25 Fuel Level Switch (FL) Three-position float switch that monitors fuel level in the generator set fuel tank.  Controls auxiliary fuel transfer relay K14 when the AUX FUEL switch (see item 18) is in ON position. When fuel level is below switch FL2B, auxiliary fuel transfer relay K14 energizes and activates auxiliary fuel pump E1 to begin fuel pumping. When fuel level rises above switch FL2A, transfer relay opens, deactivating  pump. If fuel drops below switch FL1, fault lockout relay K12 will open and de-energize governor control A5 (see item 28), cutting off fuel to engine.  The NO FUEL indicator on fault indicator module A2 will light (see item 6). 26 Fuel Level Sender (MT5) Sends generator set fuel tank level data to FUEL LEVEL meter  M5 (see item 2). 27 Lubricating Oil Pressure Switch (OP) Monitors engine oil pressure.  If oil pressure drops below 15 psi, the switch closes the circuit to energize fault lockout relay K12 and shut down engine.  The LOW OIL PRESSURE indicator on fault indicator module A2 will light (see item 6). 28 Governor Control (A5) Controls engine’s mechanical governor to adjust engine speed. 29 Engine Temperature Switch (HT) Monitors engine temperature.  If engine temperature rises above 265F (129C), the switch closes the circuit to energize fault lockout relay K12 and shut down engine.  The ENGINE HIGH TEMP indicator on fault indicator module A2 will light (see item 6). 30 Engine Oil Fill Cap and Gauge Allows for engine oil servicing.  Gauge in cap measures crankcase oil level. 31 Fuel Fill Cap Allows for generator set fuel servicing using a fill tank or fuel nozzle.  Includes a mesh fuel   strainer. 32 Auxiliary Fuel Cap Allows for connection of an auxiliary fuel hose. 33 Voltage Selection Switch Allows selection of 120VAC or 120/240 VAC on MEP-831A sets.  Voltage Selection Switch   is located on top of Power Inverter/Converter   (A8).     Change 1 2-4