Fuel Pressure Regulator; General Information - Polaris 2007 Sportsman 500 EF Service Manual

7. Loosen the fuel tank hose and pull the fuel line from the
tank.
NOTE: A small amount of fuel may come out of the
fuel line or tank. Plug the fuel line and tank inlet or
use a shop towel during removal.
Fuel Pump
CAUTION
Check the fuel test valve for any possible fuel
seepage after performing any tests or procedures.
Fuel is extremely flammable and may cause severe
burns, injury, or death. Do not use any device that
produces a flame or electrical devices that may
spark around fuel or fuel vapors.
8. Remove the air box cover and remove the two gas tank
mounting bolts at the rear of the gas tank.
9. Carefully pull the fuel tank out of the frame. Keep the fuel
tank horizontal during removal, this will keep the fuel in the
tank from spilling out the top inlet.
Fuel Line
Fuel Tank Installation
1. Reinstall the tank assembly.
2. Reconnect the sender wiring harness and route the harness
properly. Install the fuel line(s) and verify they are secure.
3. Reinstall the two fuel tank mounting bolts at back of tank.
4. Reinstall the PVT intake duct, gas tank vent line, front cab
assembly, and side panels.
NOTE: Properly route the gas tank vent lines, use
tape to secure the vent line in place. (See Pic 1).
5. Reconnect the negative battery cable. Test the sender for
proper operation.

FUEL PRESSURE REGULATOR

General Information

The fuel pressure regulator maintains the required operating
system pressure of 39 psi + 3psi. A rubber-fiber diaphragm
divides the regulator into two separate sections, the fuel
chamber and the pressure regulating chamber. The pressure
regulating spring presses against the valve holder (part of the
diaphragm), pressing the valve against the valve seat. The
combination of atmospheric pressure and regulating spring
tension equals the desired operating pressure. Any 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 Pressure Regulator Test
Refer to the "FUEL PUMP TEST" procedure.
Fuel Pressure Regulator Replacement
The regulator is a sealed, non-serviceable assembly. If it is
faulty, the pump assembly must be replaced. Refer to the Fuel
Pump/Tank Assembly Replacement procedure.
FUEL INJECTION
4.15
4