Vauxhall Workshop Service and Repair Manuals

Fuel system - Z 13 DT engine

Overview

1. Fuel filter housing 2. Rail pressure regulating valve 3. High-pressure pump 4. Rail sensor 5. Injectors 6. Intank module 7. Engine control unit

Intank module

All models with the Z 13 DT engine have an intank module in which a fuel presupply pump is incorporated.

The fuel presupply pump has the task of delivering fuel with an admission pressure of 2.5 bar and a delivery rate of approx. 145 l/h through the fuel filter to the high-pressure pump.

In addition, as already known from other intank modules, the intank module also houses the fuel gauge.

•  Service:
In service, the entire component must be replaced, only the fuel gauge can be replaced separately.

1. Fuel gauge 2. Connection - fuel delivery 3. Connection - presupply pump/fuel gauge 4. Connection - auxiliary heater 5. Connection - fuel return 6. Presupply pump

Fuel filter

The Corsa-C with the Z 13 DT engine has a new design fuel filter.

The fuel filter housing also accommodates the fuel heater, fuel temperature sensor and the filter housing water level sensor.

So that the Common Rail diesel injection system can work in an optimum manner, the fuel must be thoroughly drained of water.

The fuel filter incorporated into the Corsa-C has a higher water separation rate than the conventional diesel fuel filter. It has an efficiency of around 90%.

Because of the higher water separation rate, more separated water is collected in the fuel filter housing during vehicle operation. To hold this greater volume of water, the water reservoir has been made bigger than those on conventional diesel fuel filter housings.

•  Service:
If the water level in the fuel filter housing reaches a dangerous level, the fuel filter housing water level sensor responds and a warning light comes on in the instrument panel.

The fuel filter housing must then be drained.

A new special tool has been developed so that the fuel filter element can be replaced at the specified intervals.

To replace the fuel filter element, the cover of the fuel filter housing must be removed with the aid of special tool EN-46784 .

Tool EN-46784 will be supplied on a standing order basis with the introduction of the Z 13 DT engine.

Fuel filter housing

1. Connection - fuel supply pipe 2. Connection - fuel return pipe 3. Connection - high-pressure pump supply pipe 4. Connection - fuel pre-heater 5. Drain plug 6. Connection - temperature sensor

Fuel cooling

In the Corsa-C with Z 13 DT engine, the fuel return line on the underfloor of the vehicle has been shaped into a loop.

Thanks to this loop, the returning fuel is exposed to the ambient temperature for a longer period before returning to the fuel tank. The loop therefore performs the function of a fuel cooler.

1. Fuel cooling loop 2. Separation point - fuel cooling loop

Fuel pipes

1. Feed pipe - high-pressure pump 2. Fuel return pipe 3. Fuel supply pipe 4. Crashbox 5. Fuel filter housing