XJ6 & XJ12 Series I, II & III 1968-1992

Which Tank of Gas

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Old 06-17-2009 | 01:41 PM
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Question Which Tank of Gas

With the tank switch in the IN position, which tank am I actually using? Left or Right? I have an 84 Jaguar XJ6.
 
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Old 06-17-2009 | 05:33 PM
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on my 82 when the button is in I am using the driver side tank. with the button out, the passenger side.
 
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Old 06-18-2009 | 10:45 AM
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Default Tank

Good info. I think I'll be able to remember this one .

Let me see...IN is left tank. OUT is right tank.
 
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Old 06-18-2009 | 11:14 AM
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My 1980 4.2 XJ6 didn't have either sending unit working when I bought it. So, upon advice from a longtime jag mechanic, a valve conversion was installed that links the two tanks together and only one sending unit is needed. I leave the button out (yes, out WAS for the right hand tank) and ignore it. Cost for valve and install was about $400. Just something to consider down the road.
 
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Old 06-22-2009 | 10:49 PM
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With the switch out, you should see the letter "R" on the drivers side of the switch, indicating Right side. If not, it may be worn away.
 
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Old 07-04-2009 | 11:47 PM
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Originally Posted by freexjv12
hi fellas
i'm new here and to the whole jag thing, just been given a 1984 xj v12 5.4 its in fair to good nick. The present owner had fitted a new battery for me and had the thing fired up on two consecutive days and drove it about his garden. I went to pick it up and it fired, ran and as soon as the throttle was pressed gave up. I put fresh fuel in the right tank it took only 10ltr to fill. its showing as empty on dial. Is the right tank the reserve and smaller than the left i have the selector switch in the out position with the r showing. We flattened the battery trying to restart once it had stopped. Does the dial give an overall picture of the fuel situation or does it also switch between tanks when operating changeover switch.

Any help would be great.



Rich


Both tanks are the same size, about 12 US gallons.

Each tank has its own fuel level sending unit. The changeover switch is dual function: switches which tank fuel is draw from and also switches the sending unit

Rusty tanks are a common problem on these cars, especially if they have sat unused for some time. My gut feeling is thet you have a rust-in-the-fuel problem but of course that's only one possibilty. Removing the fuel filter and emptying the contents into a clean container might reveal important clues

Cheers
DD
 
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Old 07-06-2009 | 12:22 PM
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Default Fuel Filter

Hello Freexjv12, I am not sure on your XJ12...but I think on my XJ6 '84, the fuel filter is located in the trunk area.
 
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Old 07-06-2009 | 12:24 PM
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Originally Posted by Keith
With the switch out, you should see the letter "R" on the drivers side of the switch, indicating Right side. If not, it may be worn away.
Now I think I'll be able to remember this orientation. Switch 'OUT' - right side tank. Switch 'IN' - left side tank.
 
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