2004 Polaris Sportsman 700 EFI ATV Service Manual, Page 111Get this manual
FUEL SYSTEMFUEL INJECTION
FUEL PRESSURE REGULATOR
The fuel pressure regulator maintains the required operating system pressure of 39 psi 3psiA rubberfiber diaphragm divides the regulator into two separate sections, the fuel chamber and the pressure regulating chamberThe pressure regulating spring presses against the valve holder (part of the diaphragm), pressing the valve against the valve seatThe combination of atmospheric pressure and regulating spring tension equals the desired operating pressureAny time the fuel pressure against the bottom of the diaphragm exceeds the desired (top) pressure, the valve opens, relieving the excess pressure, returning the excess fuel back to the tank
8Remove the air box cover and remove the two gas tank mounting bolts at the rear of the gas tankRemove Bolts
FUEL PRESSURE REGULATOR TEST
Refer to the Fuel Pump Test procedure