| Removing and installing fuel pressure sender -G 247- |
| The fuel pressure sender -G 247- is located in the high-pressure accumulator, measures the current fuel pressure in the high-pressure system and transmits a voltage signal to the diesel direct injection system control unit -J248-. |
| If the sender fails, the pressure is regulated by the engine control unit using a map. In back-up function, the maximum engine speed is limited to approx. 3000 rpm. |
| »Carry out the following work sequence« |
Caution | Always read rules for cleanliness and instructions for working on fuel system → Chapter. |
| Follow these instructions before starting work and while working on the fuel system. |
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| Before removal, clean area around thread for fuel pressure sender, using e.g. a cold cleaning solvent. No dirt must enter the bore in the high-pressure accumulator. |
Note | Clean carefully; cleaning solvent must not enter the electrical connector. |
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| Dry fuel pressure sender -G 247-. |
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| Pull electrical connector off fuel pressure sender -G 247-. |
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| Unscrew fuel pressure sender -G 247-. |
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| Use suction device to extract dirt from high-pressure accumulator bore (threads and sealing surface). Do not use metal tools, etc. |
Note | Seal off high-pressure accumulator hole immediately with a suitable plug to prevent dirt from entering. |
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| Check that sealing surfaces (deformable sealing lip) and threads on fuel pressure sender -G 247- are undamaged. |
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| Also check sealing surface at high-pressure accumulator bore. |
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| The thread on the fuel pressure sender -G 247- has a special lubricating coating. The thread must be kept free of oil and grease. |
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| Screw in fuel pressure sender -G 247- by hand. |
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| Tighten sender. Specified torque → Item. |
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| After installation, run engine at moderate speed for several minutes and then switch off. |
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| Check fuel system for leaks. |
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| Then road test the vehicle with at least one full acceleration. Check high pressure part of fuel system again for leaks. |
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