﻿GET_GEVOMechL2_04_01_01_28 - ANIMATION Screen
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You have reached the end of this module!

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In this module, you learned to: State the purpose and location of the major components of the fuel system.

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The primary purpose is to provide fuel for combustion.

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The secondary purpose is lubricating and cooling high-pressure fuel equipment.

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The major components of the fuel system are: Fuel Tank

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Fuel Transfer Pump

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Fuel Filter Assembly

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High-Pressure Fuel Equipment

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Fuel Manifold

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Regulating Valve

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Engine Fuel Temperature Sensor

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Engine Fuel Pressure Sensor

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Describe how diesel flows through the fuel system.

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The four functional sections of fuel system are: Suction

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Low-Pressure Supply

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High-Pressure Supply

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Return/Regulating Valve

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An electrically driven fuel transfer pump draws fuel from the fuel tank.

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The pump provides a normal output flow rate of 12.75 GPM.

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It contains an internal pressure relief valve, which protects the pump if pressure exceeds 130 psi.

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The low-pressure fuel is then sent to the fuel manifold, which contains a fuel heater and a thermostatic mixing valve.

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The fuel heater prevents the cold diesel fuel from becoming thick and slushy.

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The thermostatic valve regulates the outlet fuel temperature.

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The thermostatic valve is normally open until the main flow temperature reaches 75°F.

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At this point, the valve starts closing and fully closes when the fuel temperature reaches 85° to 87°F.

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The fuel then flows to the fuel filter assembly, which consists of two tanks, each containing a three-piece filter element.

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The filter elements remove contaminants larger than 5 microns from the fuel.

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From the fuel filter assembly, fuel flows to each of the 12 high-pressure pumps.

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The circular supply header ensures equal distribution of fuel to each pump.

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The piston-type high-pressure pumps pressurize the fuel to 23,000 psi, and send it to the injectors.

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The Engine Control Unit governs the timing and amount of fuel delivered by each HP pump by opening and closing a solenoid on the pump.

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When HP pump is not pressurizing, the solenoid is open, which allows the fuel to pass to the low-pressure return header.

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The regulating valve provides back pressure in the low-pressure fuel lines to the HP pumps.

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Two gravity drain headers are on each side of the engine.

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After flowing through each HP pump, the fuel drains to the drain header and then back to the fuel tank.

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Describe the abnormal operating condition detection strategies used in the fuel system.

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The two detection strategies are: Low fuel supply temperature detection - If the fuel supply temperature measured by the EFT sensor is below 60°F for 30 seconds, and the water inlet temperature measured by the EWIT sensor is above 140°F for 60 minutes, an engine fuel temperature low incident is logged.

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This incident will clear if the fuel temperature is above 65°F for 30 seconds.

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Low fuel supply pressure detection - If the fuel supply pressure measured by the EFP sensor is below 30 psi for 30 seconds with the engine running, an engine fuel pressure low incident is logged.

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This incident will clear if the fuel pressure is above 50 psig for 30 seconds with the engine running.

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Describe how to check and adjust the fuel supply pressure.

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A normal fuel supply pressure reading is between 88 and 92 psi when the engine is running in Low Idle and fuel filters are new.

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The pressure reading decreases as the load increases or as the filters become dirty.

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A pressure gauge of 0 to 200 psi range can be connected to the quick-disconnect fitting to measure the pressure.

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The pressure can also be read by viewing the locomotive monitor screen on a Smart Display.

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To adjust the fuel supply pressure, loosen the regulating valve and adjust the locknut in or out to increase or decrease the pressure.

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Tighten the locknut and recheck the reading on the gauge.

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Describe how to remove and install the fuel filter elements.

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Fuel Filter Element Removal:

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1. Shut down the engine and open the fuel pump circuit breaker.

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2. Open the fuel filter drain valve, then open the vent valve, which is located above the top fuel filter canister.

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3. Loosen the nuts holding the fuel filter doors in place, swing the fasteners outward, and remove the fuel filter doors.

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4. Remove the old filter elements.

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Fuel Filter Element Installation:

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1. Install new approved filter elements.

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2. Check the condition of the O-ring seal on each filter tank door and replace the O-ring, if needed.

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3. Close and seal the filter tank doors and ensure that the vent valve is closed.

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4. Close the fuel filter drain valve.

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5. Place the locomotive in Self-Test 300 and prime the fuel system for five minutes.

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6. Start the engine, inspect the entire fuel system for leaks, and make corrections as necessary.


