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Gas Tank Sending Unit Replacement

Gas Tank Sending Unit Replacement

Shane Mantoszko

Jose Muelas wrote:

I have an '80 XJ6 SIII. It has two petrol tanks but only a gauge. With the left tank the gauge works but with the right does not work.

Recently I asked a profesional to repair the trouble and he told me that this was a very difficult trouble. Is this correct?


You are being taken for a bit of a ride here. The senders for your car sit in the rear of each tank. Take off the rear tail-light cover and you can see the round access opening with some wires coming off it. Maybe a wire is not connected, or maybe the sender itself is not working. They are fairly cheap to buy, around US$80 here in Sydney for a brand new sender. Just remove the wires from the old one, tap out the locking ring,(making sure you don't take your fingers off it, as it is a pain in the butt to get it back if you drop it in the cavity), and then withdraw the sending unit from the tank. Stick the new one in, with a new seal, fit the locking ring, making sure the seal is pressed quite tight, and then put the wires back in. It's normally also a good idea to plug the wires into the new unit whilst still outside of the car, and have someone sit in the drivers seat, and watch the gauge go up and down while you slowly lift and drop the float. If the gauge doesn't move, then the problem is somewhere else, but it is a 90% chance that the sender IS the problem.

    A few hints
  • make sure the tank is low on petrol, preferable empty
  • wet the metal lock ring and outside of the fuel tank to prevent any possible sparks from metal to metal contact
  • have an extinguisher nearby in case of fire
  • don't let a flame within 50 feet of you

good luck having a go at it yourself...

Note by Jacques Watson: The sending unit on the SII XJ6 can be taken out by first taking of a little round covering plate in the wheel well behind the rear wheel. It has two screws and is about 4 inches in diameter. This will give you access to the sending unit.


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