Figure 2.10. Duplex Fuel Filter Assembly.

Maintenance of Diesel - Electronic Locomotives and Rolling Stock
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2.12. FUEL CHECKPOINTS

Each locomotive has at least two fuel checkpoints to be inspected

before operating the engine. They are the fuelflow glasses and the fuel

cutoff valve, discussed in the subparagraphs to follow.

a. Flow. Located on the

duplex filter assembly are two

fuelflow sight glasses. The fuel

flow in the right glass, the one

nearest the engine, should be clear

and free of bubbles for proper

engine operation. Figure 2.10

shows the duplex filter assembly

and the two fuelflow glasses.

b. Cutoff valve. In an

emergency or by accident, the fuel

cutoff valve can be tripped by a

pull cord to stop the supply of

fuel to the engine. Whenever the

valve is tripped, it must be reset;

it must be open for the engine to

operate. Look at figure 2.11. The

yoke normally holds the valve open,

but when the lever is raised, the

yoke also comes up, depresses the

valve stem, and stops the fuel

flow. To reset the valve, the

lever is depressed, making the yoke

slide into place and raise the

valve stem. Fuel is once more

flowing into the engine.

Figure 2.10. Duplex Fuel Filter

Assembly.

Figure 2.11. Fuel Cutoff Valve.