Improper starting proce-
dure
Check procedure, as out-
lined in “Operation and
Maintenance Manual.”
Fuel tank empty; improp-
erly mixed fuel; con-
taminants (water, dirt,
etc.) in fuel.
Check fuel in fuel tank
and replace or add.
Fuel tank air vent closed
or restricted.
Air vent must be open
and free from contami-
nants.
A pinched or restricted
fuel line.
Check, and replace as
needed.
Dirty or restricted fuel fil-
ter
Check, replace or clean.
Enrichener Valve not op-
erating.
Check enrichener sys-
tem. (Refer to “Enri-
chener System”
following.)
An inlet needle (in carbu-
retor) that is stuck
open or closed. (A
needle stuck open, will
cause a flooding con-
dition. A needle stuck
closed, will prevent
fuel from entering car-
buretor.)
Remove, clean, or re-
place.
Anti-Siphon valve re-
stricting fuel flow.
Refer to “Checking for
Restricted Fuel Flow
caused by Anti-Siphon
Valves”, following.
See “Checking for Restricted Fuel Flow caused
by Anti-Siphon Valves, page 3A-13.
Possible Cause Corrective Action
PROBLEM 1: ENGINE TURNS OVER BUT WILL
NOT START OR STARTS HARD
WHEN COLD
Troubleshooting Charts
3A-8 - FUEL SYSTEMS 90-817643R1 DECEMBER 1996
Carburetion
Fuel System Troubleshooting
Troubles, that are caused by items 1-thru-5, listed below,
may give the impression that a problem exists in the fuel
system:
1. Spark plugs
2. Ignition spark voltage
3. Cylinder compression
4. Reed valves
5. Ignition timing
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