MIL-PRF-62678B
3.4.4 Fuel resistance. The pump shall evidence no damage or leakage when submerged
in fuel for 336 hours minimum and shall subsequently meet the performance requirements as
specified in 3.4.1 (see 4.6.3.4).
3.4.5 Environmental.
3.4.5.1 Extreme temperature resistance. Pump fuel flow, at any given pressure, shall be
not less than 67 percent (%) of the value reflected by the performance curves of figure 2, in
ambient temperatures ranging from -54 to +71 degrees Celsius (C) (-65 to 160 degrees
Fahrenheit (F) (see 4.6.4.1).
3.4.5.2 Fungus resistance. If all materials used in construction are not metallic, the pump
shall evidence no damage when subjected to fungus and high humidity conditions for
90 continuous days and shall subsequently meet the performance requirements as specified in
3.4.1 (see 4.6.4.2).
3.4.5.3 Vibration resistance. The pump shall evidence no damage or leakage and shall
subsequently meet the requirements as specified in 3.4.1 when subjected to a simple harmonic
motion amplitude of 0.76 mm (0.03 in.) at a frequency range from 10 to 55 Hertz (Hz) and return
to 10 Hz in approximately 1 minute. This motion shall be applied for a period of 2 hours in each
of three mutually perpendicular axes (total 6 hours) (see 4.6.4.3).
3.4.5.4 Shock resistance. The pump shall evidence no damage or leakage and shall meet
the requirements as specified in 3.4.1 when subjected to sawtooth wave shocks of 25 gravity
units (g) at 18 milliseconds (ms) along three mutually perpendicular axes (see 4.6.4.4).
3.4.5.5 Corrosion resistance. The pump shall evidence no damage or leakage due to
corrosion and shall subsequently meet the requirements as specified in 3.4.1, when subjected to a
salt laden atmosphere for a minimum of 100 hours (see 4.6.4.5).
3.4.6 Endurance. The pump shall maintain a delivery versus pressure relationship not
less than that specified in Figure 2 for a period described below (see 4.6.5.1):
Type I
-
630 hours
Type II
-
5040 hours
3.5 Marking. Pump marking shall include, as a minimum, the following information
permanently marked on the exterior of the pump (see 4.6.2):
a.
Pump, fuel, electrical
Manufacturer s identification
b.
c.
Military part number
d.
Polarity
e.
Voltage
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