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I have a 1985 900s sedan and my low fuel light is on even after I filled up also it still is on but it flashes and is not a solid light.
What does this mean? could it be a short.
 

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No, it can't be a short (well, it could be, but the odds are astronomical).
It's probably a bad sending unit. You could just ignore it, unless you can't check the gauge every 100 miles or so.
 

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The low level sender is a reed switch operated by a magnet on the float. They are known to fail and becomes loose. It is possible to repair /replace if the fuel sender unit is removed from the tank. Access under the trunk floor.
 

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Early sender units were a separate contact plate attached to the bottom of the float, that made contact with two exposed "pins".
Later versions (89 on?) are the magnet and reed switch arrangement.
Early senders I believe have the the blade style connectors while the later units use the round pin connectors.
 

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Early senders I believe have the the blade style connectors while the later units use the round pin connectors.
that is correct, but you can use a new style sensor and get the wiring off the same scrap car:lol:;ol;
 
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