Mercury MerCruiser Service Manual page 403

NOTE: 2 The gauge guard liquid has to be filled under a vacuum. You have to pull a vacuum through the diaphragm seal with
a vacuum pump and fill the guard through fill port on the side. Failure to do this will cause an incorrect gauge reading.
Fittings used to measure fuel temperature or Vacuum
a - From fuel supply
b - T‑fitting 6.35 mm (1/4 in.)
c - Water‑separating fuel filter
d - Pipe fitting 6.35 mm x 38 mm (1/4 in. x 11/2 in.)
e - Schrader valve
f - Temperature probe
g - Compression fitting
h - Reducer bushing
90-8M0099748 eng DECEMBER 2015
f
e
b
d
c
g
h
d d
c
g
h
b
d
f
e
b
a
© 2016 Mercury Marine
MPI ECT Fuel System
a
29511
Page 5A-33