1983 Jaguar XJ6 BaseFACTORY OEM SERVICE PROCEDURE

Fuel Pressure

  1. Depressurize fuel system by removing fuel pump relay and cranking engine for a few seconds. Turn ignition switch off and connect fuel pump relay.
  2. Disconnect fuel rail at cold start injector and connect fuel pressure gauge. Disconnect negative lead from ignition coil and turn ignition switch on. Pressure reading should be 35.5-37 psi (2.5-2.6 kg/cm2 ).
  3. Slow pressure drop is permissible; sudden pressure drop requires check of entire fuel system for leaks. After testing fuel pressure, depressurize fuel system, remove test equipment and reconnect fuel lines and ignition coil negative lead.
  4. Operate fuel change-over switch on dash and recheck reading. Reading from both fuel tanks should agree. On all models, if pressure reading is not to specifications, replace fuel pressure regulator.
Factory Service Tools

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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.

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