Key turns and the engine cranks but will not start

Hi,

Have you checked to see if there is fuel pressure to the engine?

Try this: See if the engine starts for a couple seconds using starting fluid. If it does and then stalls, we will know it's fuel related.

If you would rather check fuel pressure, here is a link that shows in general how it's done:

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Here are the specifics for your vehicle:

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1995 Jaguar XJ-6 (X300) L6-4.0L (AJ16)
Component Tests and General Diagnostics
Vehicle Power-train Management Fuel Delivery and Air Induction Fuel Pump Fuel Pressure Testing and Inspection Component Tests and General Diagnostics
COMPONENT TESTS AND GENERAL DIAGNOSTICS
CAUTION:Observe all fire hazard precautions detailed in SERVICE PRECAUTIONS, when working on open fuel systems.
Fuel system MUST be depressurized before disconnecting any fueling component.

1. Depressurize fuel system. Refer to Fuel Pressure Release / Service and Repair. See: Fuel Pressure Release > Procedures

2. Disconnect fuel feed hose from fuel rail.
3. Using appropriate adapters, fit fuel gauge between rail and hose. Be sure connections are secure.
4. Start engine and check for fuel leaks at gauge connections.
5. Fuel pressure at idle should be approximately:
34 - 38 psi with vacuum connected
42 - 45 psi with vacuum disconnected

6. Shut off engine and observe fuel pressure for a drop in pressure.
Maximum pressure drop: 10 psi in the first minute

7. If pressure drop exceeds 10 psi in the first minute, suspect the following:
- Fuel pressure regulator
- Fuel tank internal hoses and connections
- Injector leakage

8. Remove gauge and adapters.
9. Reconnect fuel lines and check for leaks.

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Let me know if this helps and what you find.

Joe