Evinrude 4906B 4HP 1969 Owner's Manual page 389

10-8 MAINTENANCE
Standard OMC fuel tank. During periods of storage
the tank should be empty and the cap "cracked" open to
allow the tank to "breathe tr •
is
the fuel tank containing fuel to be stored
for more than a month, a commercial addi-
ti
ve such as Sta-Bil should be added to the
fuel. This type of additive will maintain the
fuel in a "fresh" condition for up to a full
year.
3- Clean the
carburetor fuel filter/s
with benzol, see Chapter 4, Carburetor Re-
pair Section.
o
to it
MC fuel conditioner added the fuel will keep
to year.
fresh for up one full
Chemical additives, such as Sta-Bil and the OMC
to
Rust preventative be used when preparing the at
fuel conditioner the top of the page will prevent fuel
engine for long periods of non-use a.nd storage. from "sourinq" for up to twelve months.