FUEL SYSTEM
7-10
TNV IDI Service Manual
Fuel Injection Lines
1 – High-Pressure Fuel Injection Lines
2 – Fuel Return Line Nut
3 – Fuel Return Line
4 – Fuel Injector
5 – Gasket
6 – Protector
7 – Fuel Return Hose
8 – Fuel Injection Pump Drive Gear Nut
9 – Lock Washer
10 – Fuel Injection Pump Drive Gear Assembly
(DO NOT remove or loosen the four bolts
that fasten the injection pump drive gear to
the injection pump drive gear hub!)
11 – Fuel Injection Pump
12 – Lube Oil Line
13 – Mechanical Fuel Supply Pump (Optional on
some models)
14 – Fuel Return Fitting
15 – Low Pressure Fuel Inlet Fitting
16 – Fuel / Water Separator
17 – Electric Fuel Supply Pump
18 – Fuel Filter
19 – Fuel Filter Mount
FUEL INJECTION LINES
Removal of High-Pressure Fuel
Injection Lines
NOTICE
Remove or install the high-pressure fuel injection
lines as an assembly whenever possible.
Disassembling the high-pressure fuel injection lines
from the retainers or bending any of the fuel lines
will make it difficult to reinstall the fuel lines.
Note: To prevent “rounding” the fuel line nuts
always use a “line” or “flare nut” wrench.
1. Close any fuel valves in the fuel supply line.
2. Clean the area to keep contaminants from
entering the fuel system.
3. Place a drain pan under the fuel injection pump
to catch any spillage.
4. Loosen the fuel line nuts at the fuel injection
pump.
5. Next, loosen the fuel line nuts at the fuel
injectors. Use one wrench to hold the fuel return
line nut and fuel return line from rotating. Use a
second wrench to loosen the fuel line nut
(Figure 7-4)
. Repeat with the remaining fuel
injectors.
Figure 7-4
00022
3
7
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