Fuel Sensor Cleaning
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I decided to tackle the erroneous fuel reading which always showed over 1/2
full when in reality it was empty. I suspected that the resistor pattern on the
sending circuit board was bridged with a conductive material reducing the
electrical resistance. This 'bridging' was due to an additive in Shell gas about
a year ago. Shell claims that they do not use this additive anymore but I now
rarely use Shell.
True to my suspicions, when I took a reading after removing the unit from the
gas tank, an empty reading was only 500 Ohms instead of the 1000 as per the
shop manual. Vigorous brushing with a toothbrush and engine cleaner restored the
resistance as per specification.