My 93 XJ6 has 105,000 miles. Has been performing well until recently. While my wife was driving on the highway, the engine stopped. She was able to restart it and nurse it home. It displayed symptoms of being out of fuel. The engine continued to run, but would not develop enough power to run above 25 miles per hour. These symtoms are repeatable. I have investigated the following: 1. Replaced the fuel filter. 2. disconnected the fuel pump relay from the harness, energized it, and the pump ran continuously. 3. disconnected the fuel manifold to check if there was fuel flowing. It was flowing. 4. Added gas to 1/4 full tank.

I can not find a mechanic on big Island to check the fuel pressure. I now believe the fuel pump pumps, but I do not believe it is developing system pressure. I don't know what the pressure should be. I would like help. Perhaps someone can direct me to the fitting I need to adapt a fuel pressure gauge to the fuel manifold so I can verify the pressure?

Larince Tayler

Submitted by asemastermecha… on Sun, 08/22/2004 - 17:15

It does sound like a fuel pressure problem.
If I recall correctly, your car has two fuel pumps and a switching valve at the tank, if a pump or valve is bad, that would do what you describe, a bad pressure regulator would also.
Try reposting this one at http://www.jag-lovers.org/
You will get a faster answer during this car show season.

whunter
ASE Master Mechanic
http://www.woodwardauto.com
asemastermechanicatjuno.com