I have 2 questions. First- Oxygen sensor warning light came on. I replaced the sensor and need to know how to turn off the dash warning light.
Second- When I am running on the right tank the car acts like it is running out of fuel. With the car idling in my driveway over the weekend it did it and I noticed gas was pushing up out of the fuel fill cap even with the cap closed tightly and locked. I switched to the left tank and it stayed running and the gas stopped pushing up out of the right tank filler cap. Help ME! What's the problem?

Submitted by wljenkins@usa.net on Tue, 05/11/2004 - 09:48

If your car is a Series III, in order to access the fuel tank switch, you first disassemble the arm rest. Remove the screws that retain the plastic compartment under the arm rest. Unplug all the wires to the power window switches and remove the screw that holds the panel with the power window switches to the console. You can then remove the complete assembly that includes the ashtrays. Then remove the trim piece around the radio, the knobs for the climate control, the nuts under those knobs and the two screws at the bottom of the panel that holds the four switches one of which is the fuel tank switch. It's really pretty easy to do.

Submitted by bonnettoboot@e… on Fri, 05/07/2004 - 21:47

Perhaps I could clarify a few points on the comprehensive answer you have been given. The oxygen sensor light is triggered by mileage NOT necessarily -and unlikely- a bad sensor. The unit is accessed by removing the cover between the boot space and the rear seat, it is a "squareish" black unit with a reset button on top. As for the fuel problem, the car stalled because it had to much fuel! once the tank was full and the pump was still working the pressure in the system increased causing it to stall. The tank selector valve in the boot andf the return valves in each rear wheel well are operated by the fuel changeover switch, I would suggest you check this first, I would go as far as to recommend changing it. In the meantime just drive on the tank that was overflowing until at a quarter then switch over.

Jaguar affectionado and etc.

Submitted by tadsr@att.net on Fri, 05/07/2004 - 21:14

Thanks! I'll look for the counter and reset it. As for the fuel problem it has been an off and on thing for quite sometime until recently. I never run either tank till empty, always fill up on 1/4 tank. left tank currently has 1/4 tank in it. This winter I went over a ton of electrical contacts including the return valves and cleaned them. After reading your response and another one I'll start with the diverter valve. It may not be allowing fuel to be drawn off the right tank.
Todd

Submitted by bobinvictoria@… on Fri, 05/07/2004 - 01:08

In reading from my 1987 XJ6 III maintenance handbook on page 26, there are instructions on how to replace the O2 sensor as well as extinguishing the service interval light. "To extinguish the oxygen sensor warning light and to reset the interval counter, depress the button located on the bottom face of the counter unit. The Service Interval Counter is located on the front left hand side of the luggage compartment."

With reference to your dilema about the engine stalling and fuel running out of the gas filler cap. An understanding of how the system works may help. There is a suction line and a return line coming from/going to each tank. The suction lines join each other in a tee that is the diverter valve that is located in the boot (trunk) below the narrow floor board underneath the the floor mat (the wide floor board concealing the spare tire). In each return line there is a return valve which is accessed through a panel in the rear wheel wells (remove rear wheels for access). At rest ie when the respective valves have no power going to them via the fuel tank selector switch, the divertor valve allows fuel to be drawn by the fuel pump from the left side tank all the while, the return valve to the l/side tank allows excess fuel to be returned to the l/side tank coversely the r/side tank return valve is closed (at rest remember). When the fuel tank selector switch is toggled to draw from the r/side tank, the diverer valve is energised to switch closing off the l/side tank & opening to the r/side tank, current is also sent to both return line valves causing the right side to open and the l/side to close. The principal is to return excess fuel from the engine to the tank from which it is being drawn. If the fuel is returned to the tank opposite to the one from which the engine is being fed, eventually fuel in that tank will increase while the fuel in the tank from which the fuel is being drawn will diminish at a relatively quick rate. Hence the tank to which the fuel is being returned will over flow usually at the filler neck or possible the charcoal cannister in the r/side front wheel well.
I am a little confused about your problem because you indicate that while running on the r/side which is over flowing, the engine stalls conversly when switch to the l/side the engine runns and the over flow ceases. I believe the r/side return valve is working, fuel flows when switch to r/side and ceases when switched to left. It sounded like the divertor valve was not switching which meant that the car would have been drawing from the l/side while the fuel selector switch was right (r/side full) but you said that the car ran when switch to l/side. How much fuel is in the l/side tank? Have any of the wires on the selector switch or divertor valve been moved? It sounds as though the divertoer valve and return valves are out of sync and that you have run out of fuel on the l/tank while returning excess to the r/side. I hope this helps and I await other suggestions and how you make out. Cheers, Bob