IS F (2008-2014) Discussion topics related to the IS F model

Low Fuel Light Coming on at 1/4 Tank

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Old 06-24-13, 05:04 PM
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jleonard71
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Default Low Fuel Light Coming on at 1/4 Tank

About 2 weeks ago I got my gauge cluster replaced under warranty due to the LED's being burnt out on the tach & speedo needles. Then last week while I was driving my fuel light came on at about 1/4 tank, which I thought was kinda odd, but I just filed it up without thinking much about it or paying attention to how much fuel it took.

Then this morning when I was leaving for work I noticed that my gas gauge was at 1/4 tank, and I was in a hurry so I decided to just stop on my way home since 1/4 tank normally gives me about a 50-60 mile range and I have a 25 mile commute each way (I have even made a full round-trip on 1/4 tank before with no problems). So I got on the highway and about 5 minutes into my drive the fuel light comes on, and I checked my range and it said 17 miles - and I still had 21 miles left to get to work! WTF? The needle was almost exactly at 1/4 tank, maybe half a tick below it (see photo below). With my previous cluster the light wouldn't come until about 1-2 ticks above E, and I had even driven it to slightly below E before and still took less than 16 gals to fill up (out of a 16.9 gal tank).

Anyone have any idea why this might be causing this? Or was my old cluster the one that was a fluke with the light coming on when it was low, and this one is how it should be? I just want to get some input before going back to the dealership and having them take a look at it.



Last edited by jleonard71; 06-24-13 at 05:28 PM.
Old 06-24-13, 08:34 PM
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lobuxracer
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Mine comes on at about 14 gallons from full. Sounds like your cluster is a little too aggressive with the warning.
Old 06-24-13, 08:54 PM
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CUTigers
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Originally Posted by lobuxracer
Mine comes on at about 14 gallons from full. Sounds like your cluster is a little too aggressive with the warning.
This, I put about 14.1 or .2 gallons in when I fill up. I dont think mine has ever triggered the light at 1/4 tank mark.
Old 06-24-13, 09:52 PM
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jleonard71
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My issue isn't necessarily with the light coming on too early, because if it came on at 1/4 tank and told me I had 75 miles of range left (4 gals @ 19mpg) I could live with that. The annoying part is that the instant the light comes it it says my range is only 17 miles, which would indicate less than 1 gallon of gas, but the needle says I have about 1/4 tank (~4 gallons) which should get me about 75 miles.

And no, I don't always wait until the light comes on before I refill, but in a situation like today where it was at 1/4 tank and I didn't have time to stop and fill up right away then I need to know how much range I truly have before I'm running on fumes

So at about 14 miles from empty is when it should come on? And it should show about 50-60 miles of range if I'm getting 19-20mpg, right?

Last edited by jleonard71; 06-24-13 at 10:03 PM.
Old 06-24-13, 10:18 PM
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Joe Z
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Short and Long term read outs were erased when the speedo was unplugged & replaced.....

It will take a while for it to get back to your behavior of driving / cycles.

Mine is going in for a new cluster very soon..!!

- Joe Z
Old 06-25-13, 12:07 AM
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lobuxracer
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Originally Posted by jleonard71
My issue isn't necessarily with the light coming on too early, because if it came on at 1/4 tank and told me I had 75 miles of range left (4 gals @ 19mpg) I could live with that. The annoying part is that the instant the light comes it it says my range is only 17 miles, which would indicate less than 1 gallon of gas, but the needle says I have about 1/4 tank (~4 gallons) which should get me about 75 miles.

And no, I don't always wait until the light comes on before I refill, but in a situation like today where it was at 1/4 tank and I didn't have time to stop and fill up right away then I need to know how much range I truly have before I'm running on fumes

So at about 14 miles from empty is when it should come on? And it should show about 50-60 miles of range if I'm getting 19-20mpg, right?
No, the range is totally misleading. I've driven almost 50 miles past zero on long road trips. I never trust the range reading, only the gauge. When the needle gets to E, I have right at one gallon left.
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