4.
Install the driveshaft housing covers. Refer to Section 5A ‑ Driveshaft Housing Covers. Be certain to tighten the screws
to the specified torque.
Description Nm lb‑in. lb‑ft
Driveshaft housing cover screws (11) 6.0 53.1 –
Vapor Separator Tank (VST)
VST Removal
!
WARNING
Performing service or maintenance without first disconnecting the battery can cause product damage, personal injury, or
death
due to fire, explosion, electrical shock, or unexpected engine starting. Always disconnect the battery cables from the
battery before maintaining, servicing, installing, or removing engine or drive components.
!
WARNING
Fuel is flammable and explosive. Ensure that the key switch is off and the lanyard is positioned so that the engine cannot
start.
Do not smoke or allow sources of spark or open flame in the area while servicing. Keep the work area well ventilated
and avoid prolonged exposure to vapors. Always check for leaks before attempting to start the engine, and wipe up any
spilled fuel immediately.
!
CAUTION
Failure to release pressure from the fuel system will result in fuel spraying out, which can cause a fire or explosion. Allow the
engine
to cool completely and release all fuel pressure before servicing any part of the fuel system. Always protect eyes and
skin from pressurized fuel and vapors.
1. For electric start models: Disconnect the battery cables from the battery, starting with the negative cable.
2.
Install a fuel pressure gauge onto the fuel rail service port and release any pressurized fuel into an appropriate container.
Fuel Pressure Gauge Kit 91‑881833A03
Dual Fuel/Air Pressure Gauge Kit 91‑881834A 1
3.
Remove the starboard driveshaft housing cover. Refer to Section 5A ‑ Driveshaft Housing Covers.
4.
Using an appropriate container to capture the fuel, open the VST drain screw and allow the VST to drain completely.
5. Disconnect the high‑pressure fuel pump wire harness connector.
6. Remove the two screws securing the VST to the cylinder block, and pull the assembly away from the engine.
Service Procedures
90-8M0125265 eng NOVEMBER 2017 © 2018 Mercury Marine Page 3C-11
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