Checking the tank sender unit- paul-ryan.info Earthpoint Senderterminal
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Disconnect the wire from the sender terminal then connect the test meter between the vacant terminal and an earth point. You should get a range of readings, depending upon the position of the sender unit float. If no reading is shown, the sender unit needs to be removed for replacement or repair.

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Checking the electrics with a multimeter

Modern cars have a large amount of electrical equipment which can go wrong and so need checking. ...