G. Fuel Tank Cap
with
Check Valve
The fuel cap has a free steel ball inside
it
to
prevent
fuel from spilling
out
through the cap breather
should the machine turnover.
This
steel ball normally settles at the bottom, but
when the machine
is
inclined
to
less than 30° from
the ground
as
in a turnover, the ball
is
made
to
roll
accordingly while at the same time pushing up on
the
valve seat
(see
drawing).
When the machine is
laid flat on the ground, the
O-ring on the
valve contacts the tapered wall
of
the cap, thereby closing the breather passage
completely.
1-8
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