Mercury 25 EFI Service Manual page 216

Service Procedures
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. Disconnect the battery cable from the battery.
2. Install a fuel pressure gauge onto the fuel rail Schrader valve and release any pressurized fuel into an appropriate
container.
a
Fuel Pressure Gauge Kit
Dual Fuel/Air Pressure Gauge Kit
Digital Pressure Meter
3. Remove the clamp securing the fuel hose to the fuel cooler. Remove the fuel hose from the fuel cooler.
4. Remove the water pump indicator hose from the fuel cooler water exit port.
5. Remove the two bolts securing the fuel cooler to the fuel cooler bracket. Do not lose the gasket behind the fuel cooler.
a
b
6. Pull the fuel cooler away from the mounting bracket.
7. Remove the fuel cooler water delivery hose.
8. Remove the clamp securing the fuel hose coming from the VST. Remove the fuel hose.
a
Page 3C-32
CAUTION
!
a -
10216
a - Bolts securing fuel cooler to bracket (2)
b - Clamp securing fuel hose
c - Water pump indicator hose
c
10379
b
10380
© 2016 Mercury Marine
Schrader valve
91‑881833A03
91‑881834A 1
91‑892651A01
a - Fuel hose coming from the VST
b - Fuel cooler water delivery hose
90-8M0105568 eng MARCH 2016