F Uel S Ystem - R; Fuel System - Lean; Poor Fuel Economy; Rich - Marine Power 4.3 VORTEC MPI Owner's Manual

12.
Trouble Shooting
Fuel System - Rich
Possible Cause
Dirty/Clogged Flame Arrester
Malfunctioning Fuel Pressure Regulator

Fuel System - Lean

Possible Cause
Empty Fuel Tank
Vapor Lock
Insufficient Fuel Supply

Poor Fuel Economy

Possible Cause
Boat Hull Dirty
Incorrect Prop Size or Damage
Clogged Flame Arrester
Low Engine Compression
Engine Running Too Hot or Cold
Incorrect Fuel Grade
Boat Overload
Weight Distribution
Plugged or Restricted Exhaust
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Remedy
Check/Clean/Replace
Verify That Fuel Pressure Is Not Too High
Remedy
Fill Tank
Ventilate Engine Compartment to Reduce Temperature
Approximately 60 PSI. Fuel Pressure Must Be Adequate at Wide Open Throttle at Full Load
Remedy
Clean/Check/Adjust
Verify with Dealer or Manufacturer
Check/Clean/Replace
See Dealer
Raw Water Engines Operate at 145° F. Closed Cooled Engines Operate at 165°-185° F
Replace
Check Specifications
Check Specifications
Check Exhaust System
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