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Home >> Porsche >> 2016 >> Macan S >> Repair and Diagnosis >> External Pages >> Different car >> Section 736 (Fuel Tank & Lines - V6 S/C 3.0L Petrol -- Discovery/L462) >> Fuel Tank And Lines - V6 S/C 3.0L Petrol >> Diagnosis And Testing >> Inspection And Verification

Inspection And Verification

WARNING: This page is about a different car, the 2018 Land Rover Discovery and 2017 Land Rover Discovery. However, it is still accessible from the selected car via links, so may be relevant.
WARNING:
  • Do NOT  carry out any work on the fuel system with the engine running. The fuel pressure within the system can be as high as 1600 bar (23, 206 lb/in2 ). Failure to follow this instruction may result in personal injury.
  • Eye protection must be worn at all times when working on or near any fuel related components. Failure to follow this instruction may result in personal injury.
  • This procedure involves fuel handling. Be prepared for fuel spillage at all times and always observe fuel handling precautions. Failure to follow this instruction may result in personal injury.
  • After carrying out repairs, the fuel system must be checked visually for leaks. This should be done after the engine has been run, but with the engine switched OFF  . Failure to follow this instruction may result in personal injury.
  • If taken internally, DO NOT  induce vomiting. Seek immediate medical attention. Failure to follow this instruction may result in personal injury.
  • If fuel contacts the eyes, flush the eyes with cold water or eyewash solution and seek medical attention. Failure to follow this instruction may result in personal injury.
  • Wash hands thoroughly after handling, as prolonged contact may cause irritation. Should irritation develop, seek medical attention. Failure to follow this instruction may result in personal injury.
CAUTION:
  • Before disconnecting any part of the system, it is imperative that all dust, dirt and debris is removed from around components to prevent ingress of foreign matter into the fuel system. Failure to follow this instruction may result in damage to the vehicle.
  • The fuel pipes between the injectors and the rail must be discarded after each use, and new pipes installed. Failure to follow this instruction may result in damage to the vehicle.
  • It is essential that absolute cleanliness is observed when working with these components. Always install blanking plugs to any open orifices or lines. Failure to follow this instruction may result in damage to the vehicle.
  • Make sure that the workshop area in which the vehicle is being worked on is as clean and dust-free as possible. Areas in which work on clutches, brakes or where welding or machining are carried out are not suitable in view of the risk of contamination to the fuel system. Failure to follow this instruction may result in damage to the vehicle.
  • Make sure that any protective clothing worn is clean and made from lint-free non-flocking material. Failure to follow this instruction may result in damage to the vehicle.
  • Make sure that any protective gloves worn are new and are of the non-powdered latex type. Failure to follow this instruction may result in damage to the vehicle.
  • Make sure that clean, non-plated tools are used. Clean tools using a new brush that will not lose it's bristles and fresh cleaning fluid prior to starting work on the vehicle. Failure to follow this instruction may result in damage to the vehicle.
  • Use a steel-topped work bench and cover it with clean, lint-free, non-flocking material. Failure to follow this instruction may result in damage to the vehicle.
  • Diagnosis by substitution from a donor vehicle is NOT  acceptable. Substitution of control modules does not guarantee confirmation of a fault and may also cause additional faults in the vehicle being checked and/or the donor vehicle.
NOTE:
  • Check and rectify basic faults before beginning diagnostic routines involving pinpoint tests.
  • When measuring fuel sender resistance values with a multimeter, it is critical to use the correct multimeter setting. The multimeter should not  be on the 'Auto' setting and must  be set to 'Manual'. This will help prevent incorrect diagnosis and unnecessary replacement of fuel senders. If the multimeter range is set at 'Auto' then, during a sweep of the sender from 50 Ohms to 998 Ohms, the multimeter has to change its measurement range. For approximately 1 second, during the range switch over point, the multimeter display indicates an open circuit. This can lead to a mis-diagnosis of a fuel sender fault.
  1. Verify the customer concern.
  2. Visually inspect for obvious signs of mechanical or electrical damage.

    VISUAL INSPECTION 

    MECHANICAL ELECTRICAL
    • Fuel level
    • Contaminated fuel
    • Fuel supply line(s)
    • Fuel return line(s)
    • High-pressure fuel supply line(s)
    • Fuel tank filler pipe
    • Fuel leak(s)
    • Fuel tank
    • Fuel filler cap
    • Fuel filter
    • Push connect fittings
    • Fuel rail
    • Fuel injection pump
    • Battery charge and condition
    • Fuse(s)
    • Fuel pump module (lift pump)
    • Fuel pump module relay
    • Electrical connector(s)
    • Damaged or corroded wiring harness
    • Fuel volume control valve
    • Fuel pressure control valve
    • Engine control module
  3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
  4. If the cause is not visually evident, verify the symptom and refer to the Symptom Chart, alternatively check for Diagnostic Trouble Codes (DTCs) and refer to the DTC index.
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