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HOMESERVICE MANUALSJAGUAR2002XK8 2D COUPEREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCEFUEL DELIVERYFUEL SYSTEM-GENERAL INFORMATIONGENERAL PROCEDUREFUEL SYSTEM PRESSURE CHECK
2002 Jaguar XK8 2D Coupe

Fuel System Pressure Check

2002 Jaguar XK8 2D CoupeSECTION Fuel System Pressure Check
WARNING: Working on the fuel system results in fuel and fuel vapor being present in the atmosphere. Fuel vapor is extremely flammable, hence great care must be taken while working on the fuel system. Adhere strictly to the following precautions:
  1. Make sure the vehicle is in Park for vehicles with automatic transmission, Neutral for vehicles with manual transmission.
  2. Apply the parking brake.
  3. Place suitable absorbent material around the Schrader valve to absorb any spillage when connecting the gauge set.
  4. Remove the protective cap from the Schrader valve.
    NOTE: Depending on the design of the gauge set, there may be a drain valve and tube. Make sure this valve is closed, and the drain tube placed in a suitable container BEFORE connecting the gauge to the Schrader valve.
  5. Connect the gauge, using adaptors if required.
  6. Remove the absorbent material and dispose of safely.
  7. Disconnect and plug the vacuum hose from the pressure regulator.
  8. Start the engine and record the fuel pressure reading.
    • As a guide, the fuel pressure should be approximately 3.0 bar (44.1 psi) with the regulator disconnected.
  9. With the engine still running, reconnect the vacuum hose to the pressure regulator and record the reading.
    • The pressure should drop to approximately 2.6 bar (38 psi) when the vacuum hose is reconnected.
  10. Switch off the engine.
  11. Place more absorbent material around the Schrader valve.
  12. Where fitted, open the drain valve and allow the fuel from the gauge and line to flow into the container to depressurize the system.
  13. Disconnect and remove the gauge set and any adaptors.
  14. Clean up any fuel which may have been spilt and remove the absorbent material. Dispose of safely.
  15. Refit and secure the protective cap to the Schrader valve.
  16. Reconnect the fuel pressure regulator vacuum hose.
  17. Start the engine and make sure there are no leaks.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.