2005-2008 Honda ATV TRX500FA/FGA Fourtrax, Rubicon Factory Service Manual, Page 135Get this manual
FUEL SYSTEM Remove the O-ringClean the fuel strainer screen with non-flammable or high flash point solventDry the strainer screen thoroughlyInstall new O-ring onto the fuel valveInstall the fuel valve into the fuel tank with the two collars and bolts, and tighten the bolts securelyInstall the fuel tank (page 5-21)O-RING