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FUEL
SYSTEM
TROUBLESHOOTING
Engine cranks but won't
start
•
No
fuel to
carburetor
•
Engine
flooded with
fuel
•
No
spark
at
plug
(ignition
system
faulty}
•
Clogged
air
cloanor
•
Intake
air
leak
•
Improper choke
operation
•
Improper
throttle
operation
Engine
idles
roughly,
runs
poorly or
stalls
•
Improper choke
operation
•
Ignition
malfunction
•
Fuel
contaminated
•
Intake
air
leak
•
Incorrect
idle
6peed
•
Incorrect
pilot
screw adjustment
•
Low
cylinder
compression
•
Starting
enrichment
(SE)
valve stuck
open
•
Damaged
starting
enrichment
(SE)
valve
seat
•
Rich
mixture
•
Lean mixture
•
Clogged
carburetor
Misfiring
during acceleration
•
Ignition
system
faulty
•
Lean mixture
Afterburn during
acceleration
•
Ignition
system
faulty
•
Lean mixture
Poor performance
(driveability)
and
poor
fuel
economy
•
Fuel
system
clogged
•
Ignition
system
faulty
•
Air
cleaner
clogged
Afterfiring
•
Ignition
system malfunction
•
Carburetor malfunction
•
Lean mixture
•
Rich mixture
Lean
mixture
•
Clogged
fuel jets
•
Faulty
float
valve
•
Float
level
too
low
•
Blocked
fuel
fill
cap
air
vent hole
•
Clogged
fuel
strainer
screan
•
Restricted
fuel line
•
Clogged
air
vent
tube
•
Intake
air
leak
•
Vacuum
piston stuck
closed
Rich
mixture
•
Clogged
air
cleaner
•
Worn
jet
needle
or
needle
jet
•
Faulty
float
valve
Float
level
too
high
•
Starting
enrichment
(SE) valve stuck
open
•
Damaged
starting
enrichment
(SE)
valve
seat
•
Clogged
air
jet
Incorrect
fast idle
speed
•
Incorrect
choke
cable operation
•
Starting
enrichment
(SE)
vatve stuck or
damaged
5-3
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