A-A-52447 Pump, Fuel, Cam-Actuated: Engine, Mechanical Diaphragm And Parts Kit, Engine Fuel PumpThis commercial item description (CID) covers requirements for mechanical fuel pumps of the cam-actuated, diaphragm type used on carburetor-fed internal combustion engines. The rated flow of the fuel pumps ranges from 10 to 50 gallons per hour (gph). Requirements for repair kite to rebuild the fuel pumps are also covered.

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A-A-52447A

2 2.3 Repair parts kit. When specified (see 5.1, note c), the repair parts kit for the applicable fuel pump shall be comprised of the items listed either in the kit AED or in accordance with the manufacturer’s kit specification. The repair kit, including instructions, shall be complete and adequate as required to rebuild and restore the fuel pump’s performance as specified herein. The kit items shall not require hand fitting or machining for assembly into the fuel pump.

2.4 Performance. The fuel pump shall be capable of meeting all performance requirements when operated under conditions simulating intended use and installation on the vehicle. When specified (see 5.1, note d), the manufacturer’s test procedures may be substituted for any of the verification procedures specified herein.

2.4.1 Shut off pressure. Unless otherwise specified in the AED, the fuel pump’s shut off pressure shall be in accordance with the manufacturer’s specification. The shut off pressure shall be verified by operating the fuel pump at any speed from 200 to 1800 cycles per minute (cpm) with no flow restriction for one minute. The flow shall then be restricted to zero for at least one minute and the shut off pressure verified at the fuel pump outlet.

2.4.2 Rated flow. The fuel pump’s rated flow, in gph, at the indicated outlet pressures shall be as specified in table I. The rated flow shall be verified by operating the fuel pump at a speed of 1800 cpm for five minutes at each of the specified outlet pressures.

TABLE I. Flow rates.

2.4.3 Endurance and vibration. The fuel pump shall be without failure for at least 500 hours while being subjected capable of operation to vibration resistance. This shall be verified while the fuel pump is mounted at an angle of 30 degrees to the right or left of the normal vertical operating position, as viewed in the cam shaft axial direction. The vibration produced shall be a simple harmonic motion having an amplitude of 0.03 inch (0.06 inch maximum total excursion). The frequency shall be varied uniformly from 10 to 55 Hertz (Hz) and back to 10 Hz in about 1 minute. The endurance/vibration cycle shall be as specified in table II.