refueling. This equipment is mounted on the sides of the vehicle. 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 150 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 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 (4-inch,low
pressure control panel) delivery of fuel (gasoline or diesel) is up to 100-GPM, through one nozzle only or
through both nozzles at the same time.
Figure 3-3. M969 5,000-gallon semitrailer.
M970 5,000-Gallon Semitrailer. The M970 5,000-gallon semitrailer (Figure 3-4) is a fuel dispensing,
recirculating 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. The M970 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-
3-5
QM 5098
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