Civic L4-1668cc 1.7L SOHC MFI (2003)
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If fuel runs out of the hoses at either location, replace the fuel tank vapor control valve.
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If the fuel does not run out of the hoses, the fuel tank vapor system function is normal.
10. Disconnect the fuel tank vapor quick disconnect from the EVAP canister, then plug the port on the canister. Reapply vacuum (80 pumps).
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If the vacuum holds, replace the fuel tank control valve.
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If the vacuum does not hold, inspect the EVAP canister vent shut valve O-ring. If the O-ring is OK, replace the EVAP canister and repeat step
4.
