2006-2009 Honda TRX680 (TRX 680 FA-FGA) Factory Service Manual, Page 149Get this manual
FUEL SYSTEM (PGM-FI) QUICK CONNECT FITTING INSTALLATION Always replace the retainer of the quick connect
fitting and joint rubber when the fuel feed hose is disconnected If any retainer needs replacing, use the same manufacture's retainer as the ones being removed (The several manufactures feature different retainer specifications) If any damage or cut-out on the rubber cap, replace it with new oneI Do not bent or twist the fuel feed hose1Insert new retainer into the connector