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Strange petrol gauge issue


PeterMercedes
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11 hours ago, Badwolf said:

I had a similar problem with an older toyota. Fill up, guage reads empty, get to half way and guage reads half and then drops normally.

Yes, that's fairly common. It's caused by contamination / dirt / corrosion on the upper part of the sender track. The sender is just a variable resistor made of a wire wrap (or carbon track) with a wiper arm. If the wiper isn't making good contact then the resistance goes high and the gauge reads empty. This is quite easy to diagnose if the sender is out of the tank but you'll need to empty the tank before doing that.

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I also had a Hillman Imp. You could tell the tank was getting low from the all pervading smell of petrol which occurred when the gauge was low. Got rid of that quickly too.  Must say that both Toyota and Hillman were part exed, not sold privately. I assume that the dealers dealt with the problems,

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on a vit/herald  its reasonably easy to fish for the float arm via the filler and you can lift or sink it to check its operation without draining . 

dont use a candle to see where youre at, 

 but a stiff wire will make a probe   or a small led illuminated mirror can be useful

Pete

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