METAL BODY REPAIR - OD1653 - LESSON 2/TASK 3
remaining tank end is secured in position by seam welding.
b.
(1) Filler Neck. Filler necks on fuel tanks are manufactured from cast
iron, aluminum, or low carbon steel, then coated with lead, stamped to
shape, and soldered in place.
(2) Filler Tube (sleeve) Assembly. The filler tube is a round cylinder
manufactured from terneplate. It is used as an extension of the filler neck
to prevent fuel from sloshing out of the tank while being filled. Located
in the bottom of the sleeve is a screen (brass wire mesh) to prevent dirt or
other foreign particles from going into the tank. When fuel is to be added
to the tank, the sleeve is pulled up and locked in position.
CAUTION
When repairing
a fuel tank, make certain that the
sleeve lock is
in proper working condition.
If it
does not make
good contact with the tank, static
electricity may
result when filling and an explosion
could result.
(3) Filler Cap.
All fuel tank filler caps are not alike.
Some are
plain lock-on types while others are designed not only to prevent the gas
from sloshing out, but to allow combat-type vehicles to be used in deep-
water fording operations. Figure 39 (on the following page) illustrates a
cross section view of a pressure type fuel tank filler cap. Operation of
the pressure cap is describe below.
(a) As road heat comes in contact with the fuel tank, the fuel will
start to expand, causing the air within the tank to be compressed. At this
time, pressure put on the compression spring opens the vent and lets the
expanding fuel vapors escape from the tank.
90
Previous Page
