Evinrude 4906B 4HP 1969 Owner's Manual page 96

fuel pump, or by a leak in the line from the
fuel tank to the fuel pump.
in the carburetor and the formation
nish could cause the needle to stick in its
seat and prevent fuel flow into the bowl.
defective choke may also cause problems.
WOULD YOU BELIEVE, a majority of start-
ing troubles, which are traced
system, are the result of an empty fuel tank
or aged fuel.
Fuel will begin to sour in three to four
months and will cause engine starting
lems. Therefore, leaving the motor setting
idle with fuel in the carburetor,
tank during the off-season,
very serious problems.
as Sta-Bil may be used to prevent gum from
forming during storage
periods.
For many years there has been the wide-
spread belief that simply shutting
fuel at the tank and then running the engine
until it stops is the proper procedure before
storing the engine for any length of time.
Right? WRONG.
First, it is NOT possible to remove
fuel in the carburetor
gine until it stops.
Female fuel line connector
the male portion of the connector.
Aged fuel left
of var-
A
to the fuel
prob-
lines, or
usually results in
A fuel additive such
or prolonged idle
off the
all
by operating the en-
Considerable fuel is
to
ready be mated with
TROUBLESHOOTING
trapped in the float
passages and in the
carburetor. The ONLY
of removing ALL fuel is to take the time to
remove the carburetor,
Secondly, if the engine is operated
the fuel supply shut off until it stops the
fuel and oil mixture
removed, leaving bearings,
and other parts without
bricant.
Propel" procedure
the fuel supply at the tank; disconnecting
the fuel line at the
engine until it begins to run
stopping the engine, which will leave some
fuel/oil mixture inside; and finally removing
and draining the carburetor.
ing the fuel supply, all SMALL passages are
cleared of fuel even though some fuel is left
in the carburetor.
in combustion chamber as instructed
Owners Manual. On some model carbure-
tors, the high-speed
removed to drain the fuel from the carbure-
tor.
Choke Problems
When the engine is hot, the fuel system
can cause starting
engine is shut down, the temperature
the fuel bowl may rise to 200
the fuel to actually
are vented to allow this pressure
to the atmosphere.
fuel may percolate over the high-speed noz-
zle.
Fouled spark plug, possibly
or a
habit of over-choking
of
choke closed. Either
to
too-rich fuel mixture the cylinder.
chamber and other
line leading to the
guaranteed method
and drain the fuel.
with
inside the engine
pistons, rings,
any protective
involves: Shutting off
tank; operating
ROUGH;
By disconnect-
A light oil should be put
in the
orifice plug can be
problems. After a hot
inside
0
F and cause
boil. All carburetors
to escape
However, some of the
caused by operator's
malfunction holding
these conditions delivered
4-5
is
lu-
the
then
the
a