How to Change Your Mercruiser Water Separating Fuel Filter

An old fuel filter can slow you down. Replace your fuel filter every season or sooner if needed.

Steps

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    Turn off your battery switches or disconnect the boat's batteries.
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    Turn off your fuel supply valve (if equipped).
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    Position a fan to ventilate the bilge and work area.
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    Place some absorbent towels under the filter to catch any spilt fuel.
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    Using a fuel filter wrench, remove the old fuel filter.
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    Pour the old fuel from the filter into a clean white bucket and look for evidence of debris or water in the old fuel.
    • If you noticed a large amount of dirt or water in your old fuel filter, schedule another fuel filter replacement for after your next boating trip.
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    Inspect the filter mount bracket to insure that the old filter O-Ring has been removed.
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    Wipe clean the filter bracket and inspect the surfaces where the o-ring will have to seal.
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    Replace any damaged filter brackets.
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    Open and inspect your new filter.
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    Pour some clean fuel into the filter for easier start-up.
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    Inspect the new filter o-ring and make sure it's properly positioned on the filter.
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    Coat the new o-ring with a little clean motor oil.
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    Spin the new filter onto the filter bracket until hand tight.
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    Use the filter wrench to snug up the filter another 1/2 turn or whatever the filters instructions suggest. Never over-tighten a filter.
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    Clean up any split fuel and clear the area of all fumes.
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    Open your fuel valve.
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    Turn on or connect the boat's batteries.
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    Test run the boat and check for fuel leaks right away.

Tips

  • Change your filters frequently.
  • Keep spare filters and filter wrench on board.
  • Use a marker and write the replacement date right on the fuel filter.
  • Keep a log and save your receipts.
  • Some engines have more than one filter so read your Owners Manual.

Warnings

  • Avoid sparks or open flames.
  • Work outside with adequate ventilation.
  • Keep away from moving parts such as pulleys and belts.
  • Avoid skin contact with fuel as it can cause injury.

Things You'll Need

  • New fuel filter.
  • Fuel Filter Wrench.
  • Absorbent towels/rags.
  • Fan.
  • New motor oil.
  • Clean bucket.

Article Info

Categories: Boat Motors and Marine Engines