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Nonelectrical fuel-level indicator |
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|  MIL-T-46786B
in-tank mounted transmitter shall incorporate noncorrosive materials compatible
with the fuel tank and the panel mounted liquid quantity fuel indicator.
3.5.6.2 Nonelectrical fuel-level indicator. When specified (see 6.2), a
non-electrical fuel-level indicator shall be furnished and installed. The
mechanically actuated indicator shall incorporate noncorrosive materials
compatible with the fuel tank and shall have an indicating dial graduated
"EMPTY", "1/4", "1/2", "3/4", and "FULL". The indicator shall be labeled "FUEL
LEVEL" and located for ease of replacement and reading.
3,5.6.3 Bayonet type dipstick. When specified (see 6.2), a bayonet type
dipstick shall be furnished and installed. A separate duct and leakproof
receptacle provided in the top of the fuel tank shall be acceptable. The
dipstick shall be constructed of spring steel conforming to ASTM A 682, or
t
SAE J403 steel of greater or equal quan ity, heat treated to Rockwell C-35 to
45, compatible with the fuel tank, and calibrated in increments of 1/4 tank
capacity. The dipstick shall be etched, knurled, sandblasted, or phosphate-
coated to facilitate reading. The dipstick shall be marked in graduations of
1/4, 1/2, 3/4 and FULL and labeled "FUEL LEVEL".
3.5.7 Grounding. Metal fuel tanks shall be metal-to-metal contact with
frame, or ground strap to the frame, permitting the discharge of static
electricity.
3.5.8 Mounting. Each fuel tank, including its filler neck, shall be
constructed to permit mounting in a location where it shall not be damaged by
chafing with other parts of the equipment. Mounting attachments provided shall
k
be of a type that will not loosen when the fuel tan is attached to the
equipment and the equipment is subjected to vibration encountered in operation
and transport as specified in the equipment specification. When mounting
straps are furnished, a barrier of fuel-resistant material shall be provided to
prevent chafing of the straps and the fuel tank.
3.5.9 Suction tube or standpipe. The fuel tank shall be equipped with a
suction tube or a standpipe as specified (see 6.2), and the fuel pickup point
shall be not less than 1/2 inch above the bottom of the tank. The location of
the suction tube or standpipe shall be near the longitudinal center of the tank
to preclude starving of the engine on grades or slopes.
3.5.10 Venting. Fuel tanks shall be vented to accept fuel without spill-
back from a fueling nozzle and from a military 5-gallon fuel can. Venting
shall permit consumption of the fuel at twice the maximum volumetric capacity
of the fuel pumps, without creating a vacuum in the fuel tank of more than
3 inches of mercury. Venting shal l extend to the maximum height of the filler
neck to prevent fuel from escaping through the vent should the fuel tank be
filled to its utmost capacity. Wh en specified (see 6.2), the venting system
shall be separate from the filler cap. The venting system shall prevent the
entrance of water, dirt, or foreign matter into the fuel tank. When specified
(see 6.2), fuel tanks shall be vented above the fording depth of the equipment
on which they will be installed. The venting system, in the event that the
tank is subjected to fire, shall prevent internal tank pressure from exceeding
30 psig.
3.6
Type and construction.
3.6.1 Type I fuel tanks. Type I fuel tanks shall be constructed of
terneplate having a specified coating of not less than 0.45 ounce per square
foot (see table I). Joints and intersections shall be spot welded, projection
welded, arc welded, or seam welded, as applicable. When specified (see 6.2),
type I fuel tanks shall be soldered. Joints and intersections shall have seam
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