If you have put in an after market fuel pump,the presure of the pump might be just at the limit.The same happen to me and it cost me $$$ to be told that my new pump was not OK.
SOURCE: 92 XJ6 Fuel pump/filter
hi sometimes on most cars if lift up the back seat ther usually the pump unit on the top of the tank with two pipes coming out of it .if ypu can find the relay for the fuel pump connect the terminals 30 to 87 together you should hear the fuel pump run.alternitavely check the power to the fuel pump with a multimeter you should get 12 volt when trying to start also check for broken wirig to pump.
SOURCE: 1989 jaguar xj6
I hate to correct you Guru but on a 89 xj6 the fuel pump is located between the fuel tank and filter under the car. right above rearend. Its a littler hard to see but a easy fix
SOURCE: 1995 jaguar xj6 stalls once you stop at the stop signs
Look for an IAC sensor (motor) Idle Air Control.
Usually located on side & front of throttle body. Not 100% sure which type you'll have but if you have pintle type (pointed end) Remove it, spray it well with throttle body cleaner as well as port it came from, and retry. If it cures it temporarily & starts to do it again, replace it.
SOURCE: jaguar xj6 won't start
Timing out ,check it on no1 cylinder at TDC then check distributor position ,the arm is pointing at no1 plug lead
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fuel pump not the problem
Did you ever find the cause of your problem. I have a similar 1989 XJ6 which starts well when cold and runs for 10-15 mins at full power then misfires and will not exceed 800-900 RPM After cooling down for a few hours itruns fine again for the 10-15 mins and then misfires. I have replaced fuel pump, fuel filter, oxygen sensor, engine control unit , airflow sensor. I have checked catalytic converters internally visually and they are in good condition. I have run out of ideas except for maybe replacing ignition control unit but this is over $300 with no guarantee the problem would be cured.
Any ideas would be appreciated. Thank you
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