73-10-04
FUEL SYSTEM TROUBLESHOOTING CHART
This troubleshooting chart is provided as a guide.
Review all probable causes given, check
other listings of troubles with similar symptoms.
Items are presented in sequence of the
of probability.
CORRECTION
Check tank fuel level.
Check mixture control for proper
rigging.
Auxiliary pump switch in PRIME
position.
Position selector valve to
MAIN
TANK
position.
Reset throttle, clear engine of
excess fuel, try another start.
Loosen one line at nozzle.
If
no
fuel shows, with fuel flow on
gage, replace fuel manifold valve.
Remove nozzles and clean.
Adjust fuel-air control unit in
accordance with adjustment
procedures.
Adjust fuel-air control unit in
accordance with adjustment
procedures.
Lower unmetered fuel pressure.
Replace worn elements of linkage.
Remove and clean all nozzles.
Improper pump pressure, replace
Pump.
Check mixture control for full
travel. Check for clogged fuel
filters.
Adjust engine-driven fuel pump.
approximate
TROUBLE
Engine Will Not Start
And No Fuel Flow
Gage Indication
Engine Will Not Start
With Fuel Flow Gage
lndication
Rough Idle
Poor Acceleration
Engine Runs Rough
Low Fuel Flow
Gage
Indication
ease of checking, not necessarily in order
PROBABLE CAUSE
No fuel to engine.
Mixture control improperly
rigged.
Engine not primed
Selector valve in wrong position.
Engine flooded.
No fuel to engine.
Nozzle restricted.
Improper idle mixture.
Idle mixture incorrect.
Unmetered fuel pressure too
high.
Worn linkage.
Restricted nozzle.
Improper Mixture.
Restricted flow to metering
valve.
Inadequate flow from fuel pump.
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