Fuel System; Priming; Filling (Bleeding) - Mercury 2.8 Diesel Operation & Maintenance Manual

Section 4 - Maintenance
1. Loosen the air vent (bleed) screw on the fuel filter bracket.
2. Move the primer plunger up and down repeatedly. The filter is full when an air‑free stream of fuel flows from the air vent
screw.
3. Securely tighten the air vent screw.

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 hand pump and primer plunger up and down several times as previously outlined.
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.
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a
a
a
Typical
a - Air vent screw
23469
Typical
a - Air vent screw
b - Primer plunger
b
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Typical
a - Air vent screw
23469
90-8M0113987 DECEMBER 2015
eng