Fuel Lines - Kohler 6EKOD Installation Manual

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1. Fuel lift pump
2. Secondary filter
3. Fuel solenoid
4. Injection pump (non-service side)
5. Fuel return line
Figure 5-2 Fuel System, Typical

5.2 Fuel Lines

Return the generator set fuel return line to the fuel tank.
Locate the fuel return line as far as practical from the fuel
pickup to allow the tank fuel to cool the return fuel before
delivery back to the fuel injectors. Incoming fuel cools
the injectors to achieve maximum engine efficiency.
Note: Do not tee into the main propulsion engine's fuel
line.
Note: Fuel Return Dip Tube (6EKOD/5EFKOD and
9- -11EKOZD/7- -9EFKOZD Models). Kohler Co.
recommends utilizing a fuel return dip tube
located below the fuel supply dip tube. This will
prevent air from entering the return lines, draining
the fuel injection pump, and thus causing starting
failure or hard starting of the generator set. The
dip tube depth should be at least as deep as the
main engine fuel pick-up dip tube.
Under no circumstances should the propulsion engine
and generator set share pickup or return lines (through a
tee arrangement) that would allow the larger engine to
starve fuel from the smaller engine. It is possible that the
operation of either engine could completely drain the
fuel line of the other engine and make starting difficult.
26 Section 5 Fuel System
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12 11 10
6. Permanent supports for fuel system
components
7. Electric fuel or mechanical check valve
(customer provided)
8. Dip tube (customer provided)
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6
Use a flexible hose section to connect the metallic line
from the fuel tank to the engine's fuel pump inlet
connection point. Also, use a flexible hose section to
connect the metallic line from the fuel tank to the fuel
return connection point. The flexible section allows the
generator set to vibrate during operation.
Models:
6EKOD/5EFKOD
9- -11EKOZD/7- -9EFKOZD
Fuel Inlet
Fuel Return
Figure 5-3 Fuel Line ID Size
See Figure 5-3 for the ID size of the customer-supplied
fuel line that connects to the fuel pump and fuel return.
Route the fuel lines from the fuel tank in a gradual incline
to the engine—do not exceed the height of the generator
set and do not route fuel lines above the generator set.
Comply with
regarding fuel lines and supports.
See Section 7 for fuel feed pump inlet connection and
fuel return line connection.
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8
9
9. Fuel tank
10. Primary filter (customer provided)
11. Support clamp
12. Clamp
13. Fuel supply line
Fuel Line
ID Size
mm (in.)
9.7 (3/8)
6.4 (1/4)
min.
USCG Regulation
To
Propulsion
Engine
46CFR182.20
TP-6773 5/12a