MIL-PRF-62678B
4.6.2 Defects. Conformance to 3.3, 3.3.2, 3.3.3, 3.5, and 3.6 shall be determined by
examination for the defects listed in table V (see 4.4.2). Examination shall be visual, tactile, or
by measurement with standard inspection equipment.
4.6.3 Performance tests.
4.6.3.1 Output. To determine conformance to 3.4.1, the pump shall be tested for output
at the minimum and maximum voltages listed in table I for the grade of pump under test. Unless
otherwise specified herein (see 6.2) the test fuel shall be gasoline conforming to one of the
following: ASTM D235, type I; MIL-PRF-680, type I; A-A-52557, ASTM D4814 or MIL-DTL-
5624. The pump inlet and the test fuel level shall be maintained at the same height within ±51
mm (±2 inches). A minimum of five values each of discharge pressure, volume, and current
consumption shall be obtained at each voltage setting. The readings shall be taken at points
approximately equidistant between pressure at zero delivery and delivery at zero pressure. All
pressure readings shall be taken at the pump outlet.
4.6.3.2 Dielectric strength. To determine conformance to 3.4.2, the pump shall be
disassembled or cut open to the extent necessary to permit the internal ground connection to be
disconnected or isolated and to permit observation of the internal wiring. The pump shall then
be subjected to 500 volts root mean square (vrms) at a frequency of 60 cycles per second (cps)
applied between each conductor and ground for a period of 1 minute.
4.6.3.3 Electromagnetic interference suppression. To determine conformance to 3.4.3,
the pump shall be tested in accordance with the applicable methods of MIL-STD-461.
4.6.3.4 Fuel resistance. To determine conformance to 3.4.4, pumps shall be submerged
in fuel in accordance with the fuel resistance schedule specified in table VII. Except for the first
48 hours of phase I and phase III testing, pumps shall be operated at rated flow for 2 hours per
day. After testing, the pumps shall be subjected to the test as specified in 4.6.3.1 to verify
conformance to 3.4.1.
TABLE VII. Fuel resistance schedule.
Temperature
C ± 3 (F ± 5.4)
T Phase
Period
Medium
Phase I soak
168 hours
ASTM D471, type III
24
(75)
Phase II dry
4 hours
Air
68
(154)
Phase III soak
168 hours
ASTM D471, type III
24
(75)
Phase IV dry
4 hours
Air
68
(154)
4.6.4 Environmental tests.
4.6.4.1 Extreme temperature resistance. To determine conformance to 3.4.5.1, the pump
shall be mounted and operated as specified in 4.6.3.1, except that the values shall be recorded at
-53 ±1C (-63 ±2F) and +70 ± 1C (+158 ±2F) and the pump shall not be reoperated at 18V at
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