2006 Honda TRX680 Rincon Factory Service Manual, Page 50Get this manual
TECHNICAL FEATURES FUEL SUPPLY SYSTEM The fuel supply system is composed of the fuel tank, sub fuel tank, fuel hoses, fuel vapor return hose, throttle body, and injectorWhile riding in bumpy conditions, the fuel supply from the fuel tank may be unstable because of changes in the vehicle attitudeTo stabilize the supply of fuel, this system is equipped with sub fuel tank between the fuel tank and throttle bodyThe fuel pump and pressure regulator are located inside the sub fuel tankThe fuel hose has quick connector at the sub fuel tank jointBefore disconnecting the quick connector, always relieve the fuel pressure (page 6-32)FUEL TANK
SUB FUEL TANK -FUEL PUMPPRESSURE REGULATOR
THROTTLE BODY OPERATION Fuel flows through the fuel strainer inside the fuel tank to the fuel hose (low pressure)Inside the sub fuel tank, fuel flows though the fuel filter and is fed by the fuel pump though the fuel hose (high pressure) to the injectorThe fuel pressure through the fuel pump is regulated by pressure regulator that is located in the fuel passage in the sub fuel tank and always kept under 343 kPaFuel vapor generated in the sub fuel tank is returned to the fuel tank through the fuel vapor return hoseFUEL FLOW CHART FUEL TANK FUEL STRAINER VAPOR RETURN HOSE FUEL FEED HOSE (HIGH PRESSURE)