Mercury Racing HP565, Manual, Page: 141 / 151

TROUBLESHOOTING
eng
129
Possible Cause Remedy
Fuel line or tank vent line kinked or
restricted.
Replace kinked lines or blow out lines
with compressed air to remove
obstruction.
Crankshaft position sensor faulty. Test and replace if faulty.
Faulty fuel pressure regulator
diaphragm.
Test and replace if faulty. Do not
attempt to start the engine if the fuel
pressure regulator diaphragm is
ruptured.
Engine Hard to Start, Runs Rough, Misses, and/or
Backfires
Possible Cause Remedy
Faulty ignition system component. Service ignition system.
Clogged fuel filter. Replace filters.
Stale or contaminated fuel.
If contaminated, drain tank. Fill with
fresh fuel.
Kinked or clogged fuel line or fuel
tank vent line.
Replace kinked lines or blow out lines
with compressed air to remove
obstruction.
Flame arrestor plugged. Clean or replace the flame arrestor.
Rev limiter engaging at
wide‑open‑throttle.
Change to propeller with more pitch.
Low Engine Coolant (Closed Cooling)
Temperature
Possible Cause Remedy
Faulty thermostat. Replace.