2. Disconnect the water‑in‑fuel sensor harness connector.
3. Place a suitable container under the water‑separating fine element fuel filter.
4. Unscrew the fine element fuel filter and empty the fuel contents into the container.
5. Remove the water‑in‑fuel sensor and O‑ring from the fuel filter.
6. Install the water‑in‑fuel sensor with O‑ring into the new fuel filter. Tighten securely.
7. Fill the new fuel filter with clean diesel fuel.
NOTE: After replacing the fine element fuel filter and filling it with fuel, it is not necessary to bleed the fuel system.
8. Apply clean diesel fuel to the new fuel filter sealing O‑ring.
9. Install the new fine element fuel filter onto the filter bracket and tighten by hand.
10. Connect the water‑in‑fuel sensor harness connector.
11. After changing the fine element fuel filter, push on the primer pump on the filter housing until increased resistance is felt.
The fuel system has then been filled.
12. Visually check the fuel system for leaks.
13. Connect the battery cables.
14. Start and operate the engine. Check the filter connection for fuel leaks. If leaks exist, recheck filter installation. If leaks
continue, stop the engine immediately and contact your Mercury Diesel authorized repair facility.
Filling
A plunger‑type of primer pump is located on the fuel filter bracket and is used to:
• Fill the fuel filter when draining or changing the fine element fuel filter.
• Fill the fuel system on the engine if the system was run dry.
• Prime the fuel system if the engine has not been run for an extended period.
NOTE: Follow this procedure after installing a new filter if it has not been prefilled or if the fuel has been drained from the filter
when checking for water.
1. Loosen the bleed screw on the fuel filter bracket.
2. Move the primer pump up and down repeatedly until the filter is full and the stream of fuel flowing from the bleed screw
contains no air bubbles.
3. Securely tighten the bleed screw.
a - Primer pump
b - Bleed screw
c - Fine element fuel filter
d - Water‑in‑fuel sensor
Purging the Fuel System
IMPORTANT: The fuel line must be purged before the engine is put into operation.
1. Loosen the bleed screw on top of the fuel filter bracket.
2. Use a suitable container to collect fuel while purging the system. Clean up any spills immediately and dispose of the fuel in
a safe manner according with all local, federal, and international regulations.
Section 4 - Maintenance
90-8M0145546 eng MAY 2018 Page 59
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