| Safety precautions when working on the fuel supply system |
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| On vehicles with engine with unit injectors, the temperature of the fuel lines or of the fuel can be up to 100 °C in an extreme case. Let the fuel cool down before opening the lines, as otherwise there is a high risk of burning. |
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| The fuel system is under pressure! |
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| Wear safety goggles and safety clothing, in order to avoid injuries and skin contact with fuel. |
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| Place cleaning cloths around the connection point before detaching cable connections. Reduce pressure by carefully removing the wiring. |
| For reasons of safety the current supply to the fuel pump must be interrupted before opening the fuel system. Otherwise the fuel pump is activated when opening the driver's door. One of the following options must be used to interrupt the current supply: |
| Take out fuse for fuel pump relay -J17- |
| Disconnect the plug on the flange of the fuel delivery unit |
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WARNING | When undertaking all assembly work, particularly in the engine compartment due to its cramped construction, please observe the following: |
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| Lay lines of all kinds (e.g. for fuel, hydraulic fluid, cooling fluid and refrigerant, brake fluid, vacuum) and electrical lines in such a way that the original line guide is re-established. |
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| Ensure that there is adequate free access to all moving or hot components. |
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| When removing and installing the fuel gauge sender or the fuel delivery unit from a full or partly filled fuel tank, pay attention to the following points: |
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| The extraction hose of an exhaust extraction system which is switched on, must be positioned close to the assembly opening of the fuel tank in order to extract the released fuel vapours, even before the work is commenced. If no exhaust extraction system is available, a radial fan (motor not in air flow of fan) with a delivery volume of more than 15 m3/h must be used. |
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| Avoid skin contact with fuel! Wear fuel-resistant gloves! |
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