Priming The Fuel System; Mechanical Fuel Pump Screen; Figure 8−5 Fuel System Diagram; Figure 8−6 Fuel Bleed Components - Carrier VECTOR 6500 Operation & Service Manual

10
9
8
7
4
5
6
9
Item 8 = Leak-off
line connected at
the fuel inlet side
1. Fuel Tank
2. Supply Line
3. Electric Pump
4. Mechanical Pump
5. Water Separator
6 Heater
7. Filter
* CHECK VALVE USED WHEN LEAK-OFF
LINE IS INSTALLED AT THE INLET CON-
NECTION ONLY
Figure 8−5 Fuel System Diagram

8.5.2 Priming The Fuel System

The mechanical fuel lift pump (See Figure 8−6) 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.
To prime the fuel system, use the following steps:
a. Turn the bleed valve (red) counter-clockwise until ful-
ly opened.
62-11389
11
12
13
14
1
3
2
Item 8 = Leak-off
line connected at
the fuel outlet side
8. Filter Leak-Off Line
9. Check Valve*
10. Injection Pump
11. Injector Nozzles
12. Bleed Screw
13. Return Line
14. Level Sensor
b. Turn the top of the manual plunger counter-clockwise
to unlock it. S-L-O-W-L-Y (up/down once per second)
pump the manual plunger until positive pressure (re-
sistance) 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 fil-
ter and bleed the air out of the lines.
d. Start engine. It may be necessary to continue to
pump until the engine starts.
Running the engine for an extended period
of time with the manual plunger up can
cause a priming pump failure
e. Depress and turn the top of the manual plunger clock-
wise to lock in place.
f. When engine is running smoothly, turn bleed valve
clockwise until fully closed.
2
1
1. Mechanical Fuel Lift
Pump
2. Manual Plunger
Figure 8−6 Fuel Bleed Components

8.5.3 Mechanical Fuel Pump Screen

The fuel screen (See Figure 8−7) may become plugged
or restricted with foreign particles or wax as a result of
using the wrong grade of fuel or untreated fuel in cold
weather. This will cause the engine to lose power. The
screen must be cleaned on a regular schedule such as
unit pre-trip or when the oil and fuel filters are changed.
(Refer to Section 8.2).
8−8
CAUTION
4
3. Bleed Screw
4. Injection Pump
3