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The following test steps must be performed in the given order. If a fault is found in one test step, the subsequent test steps can be skipped.
Function Checks
Important:
The fuel system is very sensitive. Work should be done with high cleanliness and care. Air in the fuel system can cause damage to the high-pressure fuel pump. That's why the vehicle must never be driven till the fuel tank is empty.
- Check fuel tank for correct fuel sort content
- The fuel reserve must be greater than 5 L
- Check the concerned system for leaks
- Check connected hoses and tubes for kinks, damage etc.
- Point of breaks / scuff marks at the fuel or injection lines
- Check connections of the fuel lines (Quick Fittings).
- Check leak-oil lines.
- Check condition of the three-way fittings.
- Check the correct fitting of the connections and sealing.
(use only sealing, that is approved by the vehicle manufacturer)
- Check tightening-torque of the hollow screws.
- Check fuel filter
- Plugging, leakage, air or water in fuel system
- Check for pressure decrease in the fuel supply section.
After successful test/fault repair proceed to the next test step
Note:
Refer to Service Manual
Please take notice of any relevant safety measures for each work operation / step.
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