Fuel light coming on but I have fuel...

[Wanderor Cross]

So this one is rather straightforward in guessing there's a different meaning for when this happens but yesterday my fuel light came on and stayed on the entire drive while I had about half a tank.

I decided to fill up anyway even though I had recently and then later that day with a full tank it came on and stayed on again...

It doesn't come on right away so it's off after a restart but then comes back.

 

Is there a different meaning when the fuel light comes on like this or am I just finding another electrical gremlin to deal with?

 

[jonwat]

Is the fuel gauge acting normally 🤔 

[Wanderor Cross]

Yes sorry I should have clarified the gauge is working fine

Edited July 14, 2022 by Wanderor Cross
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[mike_sekinger]

Sounds like you have a dodgy fuel level sender or connection.  You`ll find that on the RH fuel tank.  On the earlier cars it`s a bobbin float type device.

They then moved to a cylinder with a sliding float type of sender.

[jonwat]

1 hour ago, mike_sekinger said:

Sounds like you have a dodgy fuel level sender or connection.

Wouldn't that also affect the gauge, which he says is working normally?

[mike_sekinger]

There are multiple connectors on the old style sender.  That could be part of the issue.

[Erikl]

There is a relay type thing that smooths out the fuel gauge action (so it doesnt flop around when going over a bump).  I think the light is on that circuit, I wonder if that relay could have an issue.  I ended up removing mine, fuell level indicator on the gauge moves around real time and the low fuel light does not come on - otherwise no issues that I have noticed.  I beleive there is a wright up on how this fuel level delay works in the awesome relay info threads.