1999-2002 TRX400EX Fourtrax Service Manual, Page 72Get this manual
FUEL SYSTEM Install new O-ring into the float chamber groove securelyInstall the float chamber, being careful not to pinch the boot and tighten the four screws
ACCELERATOR PUMP
Insert the diaphragm shaft into the float chamber through the boot and set the diaphragm rib into the groove properlyTo avoid damage to the boot, turn the shaft slowly when insertingPlace the spring onto diaphragmI nstall and hold the pump cover, being careful not to pinch the diaphragm and tighten the three screws