Fuel System - Onan L Series Service Manual

FUEL SYSTEM
REMEDY
1.
Fill fuel tank with specified fuel.
Prime fuel system.
2. Repair or replace transfer pump.
Clean inlet filter.
3. Replace seal and valve
assembly in nozzle holder body.
4. Clean fuel system components,
replace fuel filter.
5. Remove fuel injection pump for
service.
6. Adjust injection nozzles.
1.
Tighten loose fitting or replace
damaged line.
2. Replace fuel filter.
1. Replace air filter element.
2. Thoroughly clean turbocharger.
3. Tighten loose manifold retaining
nuts or capscrews. Replace manifold
gaskets.
4. Overhaul turbocharger.
1. Inspect air cleaner body, pipe,
connecting hoses, gaskets, etc.,
thoroughly for cracks or openings
which would allow air to enter engine
without passing through air cleaner.
Make necessary repairs.
2. Change engine oil and the oil filter
element at the intervals
recommended. Keep oil clean when
filling engine.
3. Use the proper fuel. It is important that
the fuel be within the specified limits
for ash, carbon, sulphur. etc., to pre-
vent excessive wear on engine parts.
4.
Check valve recession in head.
-
TROUBLE
lnsuffic~ent fuel
supply to injection
nozzles
-
Air in fuel system
Insufficient air supply
to cylinders
Rapid wear on engine
parts
POSSIBLE CAUSES
1.
No fuel in fuel tank.
2. Inoperative or plugged fuel
transfer pump.
3. Injection nozzle valve
sticking in valve body.
4. Fuel lines/fuel filter/clogged.
5. Fuel injection pump
malfunctioning.
6. Injection nozzles improperly
adjusted.
1.
Loose fuel line fitting or leak
in fuel line on suction side
of fuel transfer pump.
2. Damaged fuel filter.
1. Air cleaner clogged.
2. Excessive dirt buildup
in turbocharger.
3. Leaks in engine intake and/or
exhaust manifolds reducing
turbocharger efficiency.
4. Turbocharger rotating assembly
bearing seized.
1. Dirt admitted with
intake air.
2. Dirty crankcase oil.
3. Improper fuel.
4. Valves hitting pistons.