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CA623
Diagnosing EFI Problems (If Equipped)
NOTE: All references to EFI models apply to EFI and MPI engines.
Your Authorized MerCruiser Dealer has the proper service tools for
diagnosing problems on Electronic Fuel Injection (EFI) Systems. The
Electronic Control Module (ECM) on these engines has the ability to
detect some problems with the system when they occur, and store
a “Trouble Code” in the ECM’s memory. This code can then be read
later by a service technician using a special diagnostic tool.
CA624
Water Separating Fuel Filter
CAUTION
The electric fuel pump and factory installed water separating
fuel filter have been carefully designed to function properly to-
gether. Do not install additional fuel filters and/or water sepa-
rating fuel filters between fuel tank and engine.
The installation of additional filters may cause:
• Fuel Vapor Locking
• Difficult Warm-Starting
• Piston Detonation Due to Lean Fuel Mixture
• Poor Driveability
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