Bleeding The Fuel System - Northern Lights M773LW3G Operator's Manual

SP10. BLEEDING THE FUEL SYSTEM
CAUTION: Escaping diesel fuel under pressure can penetrate skin causing serious personal injury.
Before disconnecting lines be sure to relieve all pressure. Before applying pressure, be sure all
connections are tight and lines, pipes and hoses are not damaged. Fuel escaping from a very small hole
can be almost invisible. Use a piece of cardboard or wood, rather than hands, to search for suspected
leaks. If injured by escaping fuel, see a doctor at once. Serious infection or reaction can develop if proper
medical treatment is not administered immediately.
1. The fuel system is self-bleeding. However, any
system may need manual bleeding when:
a. A new fuel filter is installed;
b. The engine has run out of fuel;
c. The fuel lines, injection pump or any other fuel
system component has been removed and
installed.
2. Loosen bleed bolt "A" (
Figure 9
Pump hand primer "B" on fuel lift pump until pure
fuel (no bubbles) escapes from bleed bolt "A".
Tighten bleed screw "A".
Servicing
Figure 9: 843NW Fuel System.
) on top of the filter.
OM843NW3 5/19
3. Loosen bleed screw "C". Pump hand primer "B"
until pure fuel (no bubbles) escapes. Then tighten
bleed screw "C".
4. If the engine does not start after the above
bleeding process, loosen a fuel line at the injector
while cranking the engine with the starter motor
until pure fuel escapes. Then tighten the connection.
Do each line one-at-a-time.
5. After the engine has started, use a piece of cardboard
to look for fuel leaks.
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