Hisun HS700UTV-4, Руководство по обслуживанию

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ENGINE MANAGEMENT SYSTEM
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Fuel Pump
When power is supplied to fuel pump, motor in pump assembly rotates the impeller. Impeller in
turn draws the fuel from strainer and pumps the flow to generate the system pressure.
Pressure Regulator
Pressure Regulator is a diaphragm type mechanical device. Fuel flow from filter
enters in the inlet of pressure regulator. Pressure regulator regulates the fuel
pressure at a set pressure by releasing the excessive fuel flow to fuel tank.
2
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Service Procedure:
Precautions:
Before attempting any service on fuel system, following cautions should be always followed for
personal safety and to avoid system damages.
•
Disconnect negative cable at battery.
•
DO NOT smoke, and place ‘No SMOKING” sign near work area
•
Make sure to have fire extinguisher handy.
•
Make sure to perform work in well ventilated area and away from any open fire/flames.
•
Wear Safety glasses
•
To relieve fuel vapor pressure in fuel tank, remove fuel filler cap fuel filler neck and then
reinstall it.
•
As fuel lines are at high pressures when the engine is stopped, loosening or disconnecting
fuel line will cause dangerous spout of fuel. Before loosening/ disconnecting fuel lines,
please follow the “Fuel Pressure Relief Procedure” described in this section.
•
Small amount of fuel may drip after the fuel lines are disconnected. In order to reduce the
risk of personal injury, cover the pipe/ hose ends with suitable blind with no rust or
contamination.
•
After servicing, make sure that the fuel hoses and clamps are connected according to the
hose fitment instructions given in vehicle instruction manual.
•
After servicing, please follow the ‘Fuel Leakage Check Procedure’ described in this section.
•
After servicing make sure to fill at least 3 liters gasoline before pump is primed (ignition key
should be turned on only after ensuring there is minimum 3 liters of fuel in the fuel tank)
Fuel Module Diagnosis:
Step Action Yes No
1
Switch on Ignition key. Fuel Pump
primes for 3 seconds when the ignition
key is ON.
Check for fuel pump running noise for 3
seconds after ignition key is ON.
If fuel pump running
noise can be heard, go
to step 4. If fuel pump running
noise can not be
heard, go to step 2.
2
Disconnect fuel module coupler. Check
voltage at harness coupler.
Is the voltage within 10-14V
Go to step 3
Check the electrical
circuit from Ignition
to fuel module.