2007 Polaris Sportsman 700/800/800 X2 EFI Service Manual, Page 128Get this manual
FUEL INJECTION FUEL PRESSURE REGULATOR
Operation Overview
The fuel pressure regulator maintains the required operating system pressure of 39 psi3psiA rubber-fiber 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
FUEL FILTERS
General Information
NOTE: All EFI units utilize quick connect fuel linesEFI Engines use non-serviceable, high-volume, highpressure, 30-micron internal fuel pump filter and replaceable 10-micron, in-line fuel filter
10 Micron Filter