are located in the curbside equipment cabinet. It has a 4-cylinder, 4-cycle, variable speed, air-cooled diesel
engine and a self-priming, centrifugal 4-inch low pressure pump. The auxiliary engine is started by two 12-
volt batteries connected in series. The batteries are located on the left side of the equipment cabinet. The
engine controls are on the instrument panel located on the roadside of the vehicle. These controls include
an engine preheater switch, engine throttle, and control panel light. The instrument panel also includes a
voltmeter, tachometer, hour meter, oil pressure gage, fuel pressure gage, and pump pressure gage. The
pump is connected to the auxiliary engine by a bearing-mounted shaft. A firewall separates the two items.
The pumping system has a bulk fuel deliver rate of up to 600 GPM and a self-load rate of up to 300 GPM.
M969 5,000-Gallon Semitrailer. The M969 5000-gallon semitrailer is a fuel dispensing semitrailer
used primarily for refueling ground vehicles. The M969 has the same bulk delivery and self load capabilities
as the M967. It has a 5000-gallon capacity and weighs 15,000 pounds empty and 48,950 pounds full. The
M969 has the same dimensions and can be towed and transported in the same manner as the M967 tank
semitrailer. The tank body and auxiliary engine and pump assembly are identical to that of the M967. TM 9-
2320-356-12&P gives detailed information on this tank semitrailer. In addition to the equipment included with
the M967, the M969 includes equipment required for automotive refueling and limited aircraft refueling. This
equipment is mounted on the sides of the vehicles. There is a filter/separator, pump and engine
compartment, engine fuel tank, landing gear crank, and landing gear ground board on the curbside of the
vehicle. There is also an emergency valve shutoff, hose trough, and battery compartment for two batteries
on the curbside of the vehicle. There is a hose trough, portable grounding rod, landing gear ground board,
toolbox, control panel, manifold assembly, and hose reel cabinet on the roadside of the vehicle. The
filter/separator is rated at 300 GPM and 15 psi. It has three filtering stages. In the first stage, 15-filter
elements remove solid particles and coalesce any water in the fuel. In the second stage, five canisters
separate the water from the fuel and let it drain into the filter/separator sump. Finally, 15 go/no go fuses act
as safety devices to shut off the flow of fuel if the other two stages allow water to exceed a safe level. Three
of these fuses are in each of the second stage elements. Other parts of the filter/separator include an
automatic drain valve, a manual drain valve, and a pressure gage. When water in the filter sump reaches a
certain level, the water is removed by the automatic drain valve. This valve is operated by a float which
rises in water and sinks in fuel. As water enters the filter sump the float rises. When the float rises to a
certain level, a valve opens in the drain valve assembly allowing pump pressure to be applied to a
diaphragm valve. The opening of diaphragm valves causes the automatic drain valve to open, allowing the
water to drain. As the water is being drained, fuel flow is continued. If water enters the sump faster than the
automatic drain valve can carry it away, or if the filter elements fail, the go/no go fuses stop the flow of fuel
completely. The pressure gage is located on the instrument panel in the roadside equipment cabinet. It
indicates the amount of restriction in the filter/separator. Two 100 GPM meters are located in the roadside
equipment cabinet of the M969. The meter counter registers up to 9,999 gallons. To reset the count to zero,
push in the meter reset knob on the side of the meter and turn clockwise. The meter may also be used
during defueling operations. If any trouble with the meter occurs, take the vehicle to organizational
maintenance. The utility meter must also be checked for accuracy to make sure the correct amount of fuel is
being delivered. There are three dispensing assemblies on the M969 tank semitrailer. One assembly is
made up of three 14-foot sections of 4-inch suction hose. These sections are stored in troughs located on
both sides of the vehicle. This assembly has a bulk deliver rate of up to 600 GPM and a self-load rate of up
to 300 GPM. The other two assemblies are housed in the roadside equipment cabinet. Each of these
dispensing assemblies includes a meter, a hose reel with electric rewind, 50 feet of 1 1/4-inch dispensing
hose, and a dispensing nozzle. Flow rate for metered delivery of fuel (gasoline or diesel) is up to 600 GPM,
through one nozzle only or through both nozzles at the same time.
M970 5,000-Gallon Semitrailer. The M970 5,000-gallon semitrailer is a fuel dispensing semitrailer
used primarily for under-wing/over-wing refueling of aircraft. It has a 5,000-gallon capacity and weighs
15,200 pounds empty and 49,150 pounds full. The M970 has a bulk delivery rate up to 600 GPM and a self-
load rate up to 300 GPM. It is designed to be towed by a 5 ton, 6x6 truck or similar vehicle equipped with a
fifth wheel. The tank body is stainless steel and is constructed as one 5,000-gallon compartment with evenly
distributed integral baffles. The compartment has pressure and vacuum vents and a manhole with locking
device. The tank compartment is connected by piping to the vehicles fuel receipt and delivery system. In
the curbside cabinet there is a filter/separator, two 12-volt batteries, pump and engine compartment, engine
fuel tank, landing gear control, and emergency valve shutoff. The roadside cabinet houses the landing gear
ground board, recirculation fitting, portable grounding rod, toolbox, manifold assembly, control and
4-4
QM 5094
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