Service manual

ManualsBrandsBlack Widow Security ManualsHome building and DecorBW 2800

8/14/02

OTE :

When the ignition switch is turned “ON,” the

installed relay will make an audible “click.”

FUEL PUMP AND FUEL PRESSURE

REGULATOR

The fuel pump and regulator maintain fuel supply

and pressure to the injectors. When the engine man-

agement system is first “powered-up,” this pump acti-

vates for 3 seconds to pressure the fuel system then

turns off again until the engine starts. When the

engine starts, it resumes pumping, providing pres-

surized fuel to the injectors. The regulator returns

fuel to the fuel tank.

OTE :

The positive (+) pump terminal is always “hot” -

even with the ignition switch OFF. This terminal is

connected directly to the positive battery voltage

through the main fuse. The pump is activated by

ECU switching the negative circuit to ground.

Consult the vehicle wiring diagram for more detail.

The fuel pressure regulator maintains the correct

fuel pressure in the fuel rail (hoses and injectors). It

returns fuel to the tank after fuel passes the fuel

injectors. The regulator is connected to the airbox via

a small hose. On ATVs the fuel pressure regulator is

mounted on the main frame on the right side of the

vehicle (front).

Dynamic Test - Pump and Regulator

OTE :

If you suspect a problem with the fuel pump, first

check to see if it runs at all. Do the following:

Turn the ignition switch “ON” and listen to the

pump, it should make a “whirring” sound for a few

seconds to pressurize the system - then the pump

will turn off.

Start the engine and allow the vehicle to idle. You

should hear a constant whirring” sound - although

it is more difficult to hear.

OTE :

The pump will turn anytime the start button is

pressed on motorcycles, however, the pump

circuit is different is different on ATVs. If the ECU

has not powered down, the pump will not turn on

unless the clutch lever is pulled in and the start

button is then pressed momentarily.

1. If the fuel pump does not turn on, check the

following:

Pump wiring terminals. Make sure they are clean

1. Fuel pump

2. Fuel inlet (from tank)

3. Fuel outlet (to injectors)

Components have been removed for this photo.

1. Fuel pressure regulator housing

2. Fuel hose (from injectors)

3. Fuel hose (return to tank)

4. Air pressure hose (from airbox)