Carrier NDK33BN0KB, Operation & Service Manual

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62-61753-21 8-4
8.4 ENGINE SERVICE AND COMPONENTS
8.4.1 Fuel System
The fuel system (see Figure 8-1) consists of the fuel
tank, optional electric pump, mechanical lift pump, fuel
filter, fuel injection pump, the injectors and intercon-
necting tubing.
1
2
3
4
5
7
8
10
11
6
12
9
13
1. Fuel Tank
2. Fuel Supply Line
3. Electric Fuel Pump
(Optional)
4. Mechanical Lift Pump
5. Water Separator
6. Fuel Filter
7. Fuel Warmer (Option-
al)
8. Injection Pump
9. Bleed Screw
10. Fuel Leak-off Line
11. Injector Nozzles
12. Fuel Return Line
13. Fuel Level Sensor
(Optional)
Figure 8-1. Fuel System Diagram
8.4.2 Priming the Fuel System
The mechanical fuel lift pump (See Figure 8-2) is
mounted on the engine next to the injection pump.
This pump has a manual plunger for priming the fuel
system when the fuel tank has been run dry.
1
2
3
4
1. Mechanical Fuel Lift
Pump
2. Manual Plunger
3. Bleed Screw
4. Injection Pump
Figure 8-2. Fuel Bleed Components
To prime the fuel system, do the following:
a. Turn the bleed screw counter-clockwise until fully
opened.
b. Turn the top of the manual fuel pump plunger coun-
ter-clockwise to unlock it. S-L-O-W-L-Y (up/down
once per second) pump the manual plunger until
positive pressure (resistance) is felt. This may take
up to 200 strokes. This will indicate fuel flow.
c. Continue to pump S-L-O-W-L-Y (up/down once per
second) approximately 100 more strokes to fill the
filter and bleed the air out of the lines.
d. Start engine. It may be necessary to continue to
pump until the engine starts.
e. Depress and turn the top of the manual plunger
clockwise to lock in place .
f. When engine is running smoothly, turn bleed screw
clockwise until fully closed.
8.4.3 Mechanical Fuel Pump Filter
Due to foreign particles in the fuel and wax, as a result
of using the wrong grade of fuel or untreated fuel in
cold weather, the mechanical pump filter (see Figure
8-3) may become plugged or restricted, and the en-
gine will lose power. The filter must be cleaned on a
regular schedule such as when the oil and fuel filters
are changed (Refer to Section 8.1). to check the filter
do the following:
a. Turn nut (item 1, Figure 8-3) counter-clockwise to
loosen and remove.
b. Remove banjo fitting (item 2) and let it hang loose,
making sure to keep copper rings (item 4) for re-
placement.
c. Turn filter (item 3) counter-clockwise and remove.
Check and clean.
d. To install reverse steps 1 through 3.