Mercury 15 EFI FourStroke, Service Manual

Page: 134 / 406

VST Disassembly
1. Remove the four screws that secure the two halves of the VST assembly. Be careful to not spill any fuel that may remain in
the tank. Empty any fuel into an appropriate container and dispose of it according to local regulations.
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2. Gently pull on the high‑pressure fuel pump to remove it from the cover.
3. Remove the float pin from the assembly. The float and the fuel inlet needle will come free.
a - High‑pressure fuel pump
b - Float pin
c - Float
4. Disconnect the red, yellow, and white wires from the fuel pump.
5. Loosen the screw and remove the screw and clamp that secure the check valve in place.
a - Float
b - Float pin
c - Fuel inlet needle
d - Screw
e - Clamp
f - Red fuel pump wire
g - Yellow fuel pump wire
h - White fuel pump wire
6. Remove the check valve and O‑ring.
7. Remove the clip that secures the fuel pump electrical connector, and remove the connector and O‑ring from the cover.
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a
b
c
a
b
c
d
e
f
g
h
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Service Procedures
90-8M0125265 eng NOVEMBER 2017 © 2018 Mercury Marine Page 3C-13