Cosworth YB Manual - Section Management - Fuel System
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Cosworth YB Manual - Section Management - Fuel System
PART A - Engine, Engine Management and Turbocharger
[]2. Electronic Engine Management - Fuel System[/u]
The Fuel Pump
• The electric fuel pump is of roller type and is controlled by the ECU.
• The pump incorporates a non-return valve which can be replaced in service.
• The non-return valve maintains the system pressure during cranking.
• Fuel pump operation is controlled by a relay which switches the fuel pump on and off when the engine is started or stalls.
• The pump cannot be repaired and must be replaced as a unit when defective.
• Both, the power relay for the ECU and the fuel pump relay as well as the Fuses are located in a special box in the engine compartment.
The Fuel Filter
All fuel passes through a fuel filter.
The filter must be replaced at regular intervals as detailed in the service voucher booklet.
The Fuel Rail
All fuel from the filter passes to the fuel rail which is connected to all the injectors and ensures that they are supplied with fuel at the same pressure.
Relay location
1 = Power relay (brown socket)
2 = Fuel pump relay (yellow socket)
3 = Fuse - Power relay 15 A
4 = Fuse - Fuel pump relay 20 A
The Pressure Regulator
To ensure accurate fuel metering and extend the capacity of the injectors it is necessary to reduce the fuel rail pressure at idle and low power usage whilst increasing the fuel rail pressure under boost conditions. This is achieved by feeding a inlet manifold pressure signal to the fuel pressure regulator:
The Fuel Injector
The injectors are solenoid operated valves.
The quantity of fuel injected depends only on injector open time and fuel rail pressure.
Injection is in a cone shape and the feed pressure 3,0 bar (modified by manifold pressure acting on the diaphragm of the pressure regulator), sufficient to cause a very fine spray.
Injectors cannot be adjusted or repaired and have to be replaced as a unit when defective.
Pressure regulator cross section
1 = Fuel from fuel tank
2 = Fuel return
3 = Diaphragm
4 = Connection, inlet manifold pressure
5 = Inlet manifold pressure
[]2. Electronic Engine Management - Fuel System[/u]
The Fuel Pump
• The electric fuel pump is of roller type and is controlled by the ECU.
• The pump incorporates a non-return valve which can be replaced in service.
• The non-return valve maintains the system pressure during cranking.
• Fuel pump operation is controlled by a relay which switches the fuel pump on and off when the engine is started or stalls.
• The pump cannot be repaired and must be replaced as a unit when defective.
• Both, the power relay for the ECU and the fuel pump relay as well as the Fuses are located in a special box in the engine compartment.
The Fuel Filter
All fuel passes through a fuel filter.
The filter must be replaced at regular intervals as detailed in the service voucher booklet.
The Fuel Rail
All fuel from the filter passes to the fuel rail which is connected to all the injectors and ensures that they are supplied with fuel at the same pressure.
Relay location
1 = Power relay (brown socket)
2 = Fuel pump relay (yellow socket)
3 = Fuse - Power relay 15 A
4 = Fuse - Fuel pump relay 20 A
The Pressure Regulator
To ensure accurate fuel metering and extend the capacity of the injectors it is necessary to reduce the fuel rail pressure at idle and low power usage whilst increasing the fuel rail pressure under boost conditions. This is achieved by feeding a inlet manifold pressure signal to the fuel pressure regulator:
The Fuel Injector
The injectors are solenoid operated valves.
The quantity of fuel injected depends only on injector open time and fuel rail pressure.
Injection is in a cone shape and the feed pressure 3,0 bar (modified by manifold pressure acting on the diaphragm of the pressure regulator), sufficient to cause a very fine spray.
Injectors cannot be adjusted or repaired and have to be replaced as a unit when defective.
Pressure regulator cross section
1 = Fuel from fuel tank
2 = Fuel return
3 = Diaphragm
4 = Connection, inlet manifold pressure
5 = Inlet manifold pressure
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