Fuel System Troubleshooting - Honda Nighthawk CB 750 1991 Service Manual

Nighthawk nighthawk cb 750
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Fuel
System
3
Troubleshooting
Engine Won't Start
Too much fuel getting to the engine
-Air cleaner clogged
-Flooded carburetor
Intake air leak
-
Fuel contaminatedldeteriorated
.
No fuel to carburetor
-Fuel strainer clogged
-Fuel tube clogged
-Fuel valve stuck
-Float level misadjusted
-Fuel tank breather hole clogged
Lean Mixture
.
Fuel jets clogged
Float valve faulty
Float level too low
Fuel line restricted
-
Carburetor air vent tube clogged
lntake air leak
Throttle valve faulty
-
Vacuum piston faulty
-
California Model Only: EVAP CAV control valve faulty
Rich Mixture
-
Bystarter valve in ON position
Float valve faulty
-
Float level too high
Air jets clogged
.
Air cleaner contaminated
Flooded carburetor
Engine Stalls, Hard To Start. Rough Idling
Fuel line restricted
.
Ignition malfunction
.
Fuel mixture too leanlrich
.
Fuel contarninatedldeteriorated
-
lntake air leak
Idle speed misadjusted
.
Float level misadjusted
Fuel tank breather hole clogged
Pilot screw misadjusted
Slow circuit or bystarter circuit clogged
Emission control system malfunction
(California Model Only)
-EVAP CAV control valve faulty
-EVAP purge control valve
-loose,
disconnected or deteriorated hoses of the emis-
sion control system
Afterburn
When
Engine
Braking
Is
Used
Lean
mixture
in
slow
circuit
Emission control system
malfunction
(California
Model
Only)
-pulse
secondan/
air
supply
system
faulty
-loose,
disconnected
or
deteriorated
hoses
of
the
emission
control
system
Afterburn Or Misfiring During Acceleration
.
Ignition system faulty
Fuel mixture too lean
Poor Performance
(Driveability)
And
Poor
Fuel
Econ-
omy
.
Fuel
system
clogged
-
lgnition
malfunction
-
Emission
control
system
malfunction
(California
Model
Only)
-EVAP
CAV
control valve
faulty
-loose,
disconnected
or
deteriorated
hoses
of
the
emission
control
system

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