NONRETURN VALVE INSPECTION
1. Remove the fuel pump. (See FUEL PUMP UNIT REMOVAL/INSTALLATION.)
• The nonreturn valve cannot be removed as it is built into the fuel tank.
• The nonreturn valve is normally closed due to spring force.
2. Verify that the nonreturn valve opens/closes from the fuel pump installation hole.
• If it does not open/close or return to the normal position, replace the fuel tank.