!
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.
IMPORTANT: The FSM does not have a drain port incorporated into the upper or lower housing. If the FSM requires
disassembly, the extraction of fuel in the FSM can be accomplished with the following method. Disconnect the fuel supply
hose on the FSM. Attach a fuel pressure gauge to the fuel rail test port. Drain the fuel with the pressure gauge into an
appropriate container by turning the key switch "ON" several times while holding the purge valve open, or use the CDS G3
diagnostic interface tool to energize the fuel pumps.
2. Disconnect all batteries from the engine and disconnect the FSM electrical connector.
!
CAUTION
Disconnecting or connecting the battery cables in the incorrect order can cause injury from electrical shock or can damage
the electrical system. Always disconnect the negative (‑) battery cable first and connect it last.
3. Loosen the clamp on the water hose to crossover and remove the hose.
a - Water hose to crossover
b - To intake manifold vacuum line
c - Bracket mount screws (2)
d - Line to fuel filter
e - Hose to strainer
f - Hose to injector rail
g - FSM mount screw
h - FSM electrical connector
i - Bracket
4. Push the blue release button of hose to injector rail at the rail.
5. Push the blue release button intake manifold vacuum line and remove the line.
6. Remove line to fuel filter by pushing the blue release button.
7. Remove hose to strainer at the stainer by removing the worm drive clamp.
8. Remove the two bracket mounting screws and remove the FSM and bracket assembly.
9. Remove one FSM mount screw and remove FSM from the bracket.
10. Remove Oetiker® clamp from hose to strainer and remove the hose.
FSM Disassembly
NOTE: The FSM cannot be completely drained of fuel prior to disassembly. Use appropriate containers to capture fuel during
the disassembly process. Wipe up fuel spills immediately and dispose of in an appropriate container.
1. Place the FSM in an appropriate container to capture any fuel that will spill.
MPI ECT Fuel System
90-8M0099748 eng DECEMBER 2015 © 2016 Mercury Marine Page 5A-11
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