Mercury Marine MCM 4.3L / MCM 4.3L EFI — Changing Water Separating Fuel Filter
Maintenance
For the Mercury Marine MCM 4.3L / MCM 4.3L EFI, from the Mercury Marine service manual.
Before you start
- Gasoline is extremely flammable and highly explosive; ensure ignition key is OFF
- Wipe up any spilled fuel immediately
- Make sure no fuel leaks exist before closing engine hatch
Procedure
- Unsnap latch and slide top and bottom cover pieces from around filter and bracket.
- Remove water separating fuel filter and sealing ring from bracket; discard.
- Coat sealing ring of new filter with motor oil.
- Thread filter onto bracket and tighten securely by hand; do not use a filter wrench.
- Start and run engine.
- Check filter connection for gasoline leaks.
- Install cover pieces around fuel filter and latch top part to lower part.
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.