Fuel System; Priming; Filling (Bleeding); Fuel Tank Cleaning And Flushing - Mercury 92-8M0069603 Operation & Maintenance Manual

Fuel System

Priming

Prime the engine if it has not been run for an extended period or if the engine will not start.
1. Move the primer plunger up and down repeatedly.
2. Attempt to start the engine.

Filling (Bleeding)

NOTE: Follow this procedure if the fuel system was run dry or if part of the fuel system was drained for a service function.
1. See Water Separating Fuel Filter ‑ Filling and fill the fuel filter.
2. Check the filter and drain cap for fuel leaks. Ensure that the bleed screw on the fuel filter bracket is closed.

Fuel Tank Cleaning and Flushing

IMPORTANT: Diesel fuel should not be left in the tank during winter storage, as an accumulation of rust, sludge, and wax
residue will form.
Refer to the boat manufacturer's instructions and clean the fuel tank at specified intervals. Unless specified otherwise, flush and
clean the diesel fuel tank every 1000 hours or five years, whichever occurs first.

Seawater System

Draining the Seawater System

Water can enter the bilge when the drain system is open, damaging the engine or causing the boat to sink. Remove the boat
from the water or close the seacock, disconnect and plug the seawater inlet hose, and ensure the bilge pump is operational
before draining. Do not operate the engine with the drain system open.
IMPORTANT: The engine must be as level as possible to ensure complete draining of the seawater system.
Drain the seawater system before flushing or prior to cold weather (freezing temperature), seasonal storage, or extended
storage.
IMPORTANT: The engine must not be operating during this procedure.
Water can enter the bilge when the drain system is open, damaging the engine or causing the boat to sink. Remove the boat
from the water or close the seacock, disconnect and plug the seawater inlet hose, and ensure the bilge pump is operational
before draining. Do not operate the engine with the drain system open.
1. Remove the boat from the water if possible.
90-8M0113986 DECEMBER 2015
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a - Fuel priming pump
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CAUTION
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CAUTION
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Section 4 - Maintenance
Page 49