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Home›Repair guides›Mercury Marine›Water Separating Fuel Filter Replacement

Mercury Marine MCM 3.0L — Water Separating Fuel Filter Replacement

Maintenance · Fuel System

For the Mercury Marine MCM 3.0L, from the Mercury Marine service manual.

Applies to: General Motors MCM 3.0L / 3.0LX engine

Before you start

  • Always disconnect battery cables BEFORE working on fuel system to prevent fire or explosion

Procedure

  1. Disconnect battery cables from battery.
  2. Remove fuel filter from base; a filter wrench may be needed to loosen element.
  3. Lubricate sealing ring(s) of new filter with SAE engine oil.
  4. Install new filter, tightening securely by hand.
  5. Reconnect battery cables, ensure water is supplied to cooling system and start engine.
  6. Check for fuel leaks.

Tools required

Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.

Source: Mercury Marine service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.

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