TM 5-3895-373-201.15.FUELSYSTEM.1.15.1. EngineCombustionFuelSystem. The engine combustion fuel system consists of afuel tank, fuel/water separator, fuel lift pump, fuel filter,two test transmitters, fuel injection pump, and engine fuelinjectors.The fuel tank is a 28 gal (106 Q) fuel storage source forthe paving machine. The fuel tank fill contains a strainerfor filtering out large particles. An electrical fuel leveltransmitter controls the fuel gauge on the operatorcontrol panel. The fuel tank outputs to a fuel/waterseparator.A diaphragm-type fuel lift pump draws fuel from the fueltank through a fuel/water separator, forcing the fuel on tothe test transmitters and the fuel filter. The fuel pump isdriven by an eccentric on the engine cam. A lever on thefuel pump can be used to manually feed fuel through thesystem.The fuel pump output is sent to the first transmitter whichmeasures fuel pressure for use by the STE/ICER TestSet, Test No. 24. The second transmitter measures fuelpressure into the fuel filter and compares it with the fuelpressure out of the fuel filter for STE/ICER Test No. 26.The fuel filter has two inputs that remove impurities fromthe fuel supply through a filter. One input is from the fuellift pump and the second input is from the overflow of theinjectors on the engine. Two outputs from the fuel filterfeed the injection pump. A third output is a return to thefuel tank for excess fuel.Fuel is forced from the fuel filter to a fuel injection pump.This pump uses both a high pressure and a low pressureinput. The pump is driven by engine timing gears toprovide fuel to each cylinder injector. Excess fuelsupplied to the injectors is returned to the fuel filter.1-18
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