Evinrude 4906B 4HP 1969 Owner's Manual page 142

tightened securely
HOWEVER, do not tighten
where an adjustment
hand.
4-11 FUEL PUMP
A considerable number of fuel pump de-
signs and sizes have been installed
larger Johnson/Evinrude
this manual. Only one can be rebuilt and
detailed procedures
given in this section.
This fuel pump has three nipples provid-
ing the means of connecting
um lines. The vacuum line is connected to
one nipple. The other end of this hose is
connected to the vacuum side of the engine.
The inlet hose (from the fuel tank), is con-
nected to the second nipple.
hose (to the carburetor),
third nipple.
l'viinor changes
into the fuel pump over the years.
changes will be identified in the text.
All other fuel pumps must be replaced as
a unit. However, the pump cover can be
SEAT
DIAPHRAGM
INLET
VALVE
Functional diagram
fuel pump during UPWARD
causing a vacuum condition
how the intake valve in the fuel pump is open
outlet valve is closed.
to hold the adjustment.
it to the point
cannot be made by
SERVICE
on the
engines covered in
with illustrations
fuel and vacu-
The outlet
is connected to the
have been incorporated
These
OUTLET
VALVE
to
illustrate operation
movement of the piston
in the crankcase. Notice
and the
are
~:
(~I "-"--
FUEL TANK
~
Functional
fuel pump during
causing pressure in the crankcase.
pump inlet valve is closed and the outlet
to
allow fuel
removed,
placed, and a
The accompanying
ly a couple of these fuel pumps, including
the unit that can be rebuilt.
of
the
Fuel pump with the vacuum, fuel outlet,
inlet fittings
can
pump that
FUEL PUMP
to
diagram illustrate
DOWNWARD movement
to to
be transferred the carburetor.
the filter screen cleaned
cover gasket installed.
NEW
illustrations
oniy
visible. This is the
be rebuilt.
4-51
PRESSURE
OUTLET
VALVE
operation of
the
of the piston,
Notice how the.
valve is open
or re-
show on-
and fuel
Johnson/Evinrude