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

TABLE II. Endurance test factors.

2.4.4 Leakage. The fuel pump shall be capable of withstanding an internal air pressure of 10 pounds per square inch (psi) without any damage or leakage. This shall be verified by submerging the fuel section in water and the outlet port plugged.

2.4.5 High temperature. The fuel pump shall meet the performance requirements of d.1 through d.4 while operating in an ambient temperature of 160 degrees Fahrenheit (°F). This shall be verified by filling the fuel pump with a high flash point (140°F) mineral/petroleum type spirits solvent degreaser and conditioned for not less than 4 hours in an ambient temperature of 160°F prior to operation. The fuel pump’s flow rate (see d.2) shall be met while operating in this ambient temperature except that the fluid test temperature shall not exceed 100°F.

2.4.6 Low temperature. The fuel pump shall meet the performance requirements of d.1 through d.4 while using a low temperature (below 32°F) gasoline and operating in an ambient temperature of minus 25°F. This shall be verified after the fuel pump and fuel have been conditioned for not 1ess than 16 hours in an ambient temperature of minus 65 ± 5°F. The fuel pump shall then be drained and operated. The fuel pump’s delivery shall be verified as follows:

a. Fuel pumps with rated flow of 10 gph or less shall be capable of self-priming and delivering not less than two fluid ounces of fuel within the first 120 cycles of operation while operating at a speed of 200 cpm.