Float Test

Make sure the fuel tank is less than half full.
Remove the fuel fill cap to relieve the fuel tank pressure, then reinstall the cap.
Remove the left rear inner fender. Disconnect the fuel tank vapor recirculation tube (A), and connect a vacuum pump to the vapor recirculation tube.

Fig 1: Connecting Vacuum Pump To Vapor Recirculation Tube
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Plug the line (B).
Apply vacuum to the fuel tank vapor recirculation tube (A).
- If the vacuum holds, replace the fuel tank vapor control valve (see Fuel Tank Vapor Control Valve Replacement ).
- If the vacuum does not hold, the float is OK. Go to step 1 of the valve test.