MX-5 Miata Mazdaspeed L4-1.8L DOHC Turbo (2004)
Air Injection Check Valve: Testing and Inspection
NONRETURN VALVE INSPECTION
1. Remove the nonreturn valve. (See FUEL TANK REMOVAL/INSTALLATION)
2. Verify that the nonreturn valve operates under its own weight.
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If the valve does not operate, replace the nonreturn valve.