Fuel System Structure; Chapter 3 Vehicle; Section 1 Fuel Supply System - ZONGSHEN ZS250GY-3 Service Manual

Fuel supply system consists of fuel tank,fuel pump,injector,fuel filter and oil pipe.
1 The Structure and Working Principle of Fuel System
[1] Fuel Tank
Fuel tank is jointed by the armor plate which is normally 0.8mm～1.0mm.Some fuel tank is jointed
apertured clapboard inside,which not only strengthens the fuel tank,but also avoids the fuel gurgitation
during riding.Because of the strong erosion of oil,it must be galvanized on the surface of fuel tank.There is
a fuel-adding hole on the top of fuel tank and close the fuel cap which has air hole,so that it can avoid fuel
leakage during riding and ensure the balanced pressure of inner and outer fuel tank.So that fuel can flow
out naturally.
[2]Fuel Pump
The fuel pump consists of pump, support and oil pressure adjuster. Flexible installation can decrease
the vibration on the fuel pump. The pump installed in the fuel tank is to get a simple construction and
non-leakage.
The pump adopts turbo, single stage and electric type. It is driven by a DC motor with 12V and
controlled by ECU through the pump relay. There is a one-way valve at the exit of the pump which can
prevent the oil from flowing back to the bank when engine stops and ensures a good starting performence.
[3] Fuel Injector
Fuel injector injects the proper amount of atomized fuel into the intake pipe of engine by ECU,thus
the atomized fuel can participate in the combustion process in the cylinder.
[4]Fuel Filter
Fuel filter connects with the oil way between the electric fuel pump and fuel rail. This system adopts
the dedicated filter for EFI to make impurities not block the nozzle. The housing of filter has enough
intensity and it never break due to the fuel pressure.
[5]Fuel Pipe
The pressure of the fuel supply system is 250kPa. Its selection must have enough safety factor for
security.
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Chapter 3 Vehicle

Section 1 Fuel Supply System