The purpose of cleaning and flow-testing is to remove any contaminants inside or outside the injector that impede fuel flow or degrade fuel spray pattern, to accurately measure each injector's fuel flow ability and acquire data on injector performance that you can use in matching injectors or tuning the engine.

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The test process is as follows: first, your injectors are installed on APF's  computer-controlled injector flow-testing equipment. A unique, non-flammable, gasoline-like test fluid is pumped at a precisely-controlled pressure through the injectors while they are pulsed by injector-drivers built into the equipment. The volume of fuel passed through the injector is accurately measured for a set amount of time and from those figures, fuel flow is derived. During the flow- test, the injector spray patterns are visually inspected and analyzed by APF's technicians.

After the initial flow-test, your injectors are transferred to an ultrasonic cleaning machine and connected to injector drivers. They are submerged in cleaning solution and pulsed while being subjected to ultrasonic waves. The combination of the solution and the ultrasound aggressively clean the internal and external parts of the injectors.

Finally, the now-clean injectors are reinstalled on the flow-tester and ran again. At the conclusion of the test, a printed report is produced. This report lists: fuel flow rates (in pounds-per-hour) before and after cleaning, and spray pattern assessments for each injector tested. Also included is the "system balance" number which is the flow difference, expressed in a percentage, between the injectors having the highest and lowest flow rates amongst the injectors tested. Injector O-rings and filter baskets are replaced as needed and included in the cost.

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