Piper ARROW III Service Manual page 341

TABLE VIII-III. TROUBLESHOOTING CHART (ENGINE) (cont.)
Trouble
Low fuel pressure.
High fuel
pressure.
Revised: 8/31/77
CHEROKEE ARROW III SERVICE MANUAL
Cause
Restricted flow to
fuel metering valve.
Fuel nozzle vent
system defective
causing improper
pressure regula-
tion.
Fuel control lever
interference.
Incorrect fuel in-
jector pump adjust-
ment and operation.
Defective fuel in-
jector pump relief
valve.
Air leakage in fuel
pump pressurization
line.
Restricted flow be-
yond fuel control
assembly.
Defective relief
valve operation
in fuel in-
jector
Check mixture control for full travel. Check for
restrictions in fuel filters and lines; adjust
control and clean filters. Replace damaged parts.
Check venting system for leaks at connections and
other defects. Tighten connections and replace
defective parts.
Check operation of throttle control and for possible
contact with cooling shroud. Adjust as required to
obtain correct operation.
Check and adjust using appropriate equipment.
Replace defective pump.
Replace pump if cleaning and lapping valve does not
correct problem.
Locate cause of leakage and correct.
Check for restricted fuel nozzles or fuel manifold
valve. Clean or replace nozzles. Replace defective
fuel manifold valve.
Check fuel injector pump control line from turbo-
charger for loose connections and defects. Tighten
connections, replace damaged line.
2C15
POWER PLANT - CONTINENTAL
Remedy