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Home >> Mazda >> 1990 >> 626 Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Fuel System >> Injector Fuel Leakage
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Injector Fuel Leakage

  1. Relieve fuel system pressure. See BASIC TESTING article. Remove air valve or dynamic chamber, if necessary. Remove delivery pipe with hoses still connected. Remove fuel injectors. Using wire, secure injectors tightly onto delivery pipe.
    CAUTION: Ensure injectors are securely tied to delivery pipe. If not properly secured, fuel may spray from loose connections.
  2. Install a jumper wire between terminals of Yellow fuel pump check connector. Fuel pump check connector is located on firewall, under windshield wiper motor.
  3. Turn ignition on for 10 seconds. Turn ignition off and clean injector nozzles. On 4-cylinder models, tilt injectors approximately 60 degrees. On all models, turn ignition on. Check that no fuel leakage exists at injectors. After one minute, a drop of fuel leakage is acceptable. If fuel leakage is excessive, replace faulty injector.
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