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Just an FYI...

I had a rear gas tank strap that was broken... thus the tank was hanging a bit low in the backend... (my skid plate was likely keeping it in place)

I've since replaced my rear tank strap and I noticed that the fuel gauge was taking forever to reach "full" after I filled it.

Now, after a number of weeks the gauge seems to move to the "F" quicker after a fill.

Just thought I would add this useless info to the thread ;)
 

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I have a 2012 FJ w/ 117k and just experienced this for the first time. Gas gauge hung up at right around 1/8 tank. No gas light. Engine stalled right as hit my ODO reading right when I would have expected it (I should have seen it coming!).

Filled up and the gas gauge now reads full. Will be interesting to see what happens as I drive through the tank of gas. Hard to tell from this thread if the problem repeats every time or is intermittent.

I am surprised that this appears to be a fuel level sender issue as I got accurate readings right up until it stuck at 1/8 tank. Seems like that would be more indicative of a float problem? For that reason I am hoping (probably foolishly) that somehow the gripe just goes away.

Previously someone asked if there was anything the float/sender assy affects other than the gas gauge itself? I.e. does the ECM use that information for anything? In other words, if one were to NOT fix the issue, and just deduce gas level via ODO and/or Ultragauge, will it damage anything?
 

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I have a 2012 FJ w/ 117k and just experienced this for the first time. Gas gauge hung up at right around 1/8 tank. No gas light. Engine stalled right as hit my ODO reading right when I would have expected it (I should have seen it coming!).

Filled up and the gas gauge now reads full. Will be interesting to see what happens as I drive through the tank of gas. Hard to tell from this thread if the problem repeats every time or is intermittent.

I am surprised that this appears to be a fuel level sender issue as I got accurate readings right up until it stuck at 1/8 tank. Seems like that would be more indicative of a float problem? For that reason I am hoping (probably foolishly) that somehow the gripe just goes away.

Previously someone asked if there was anything the float/sender assy affects other than the gas gauge itself? I.e. does the ECM use that information for anything? In other words, if one were to NOT fix the issue, and just deduce gas level via ODO and/or Ultragauge, will it damage anything?
I have a 2007 with the same 1/8 tank behavior. Been driving it for a while (years) with the issue with no other concerns from it I have discovered. Not sure if the newer models do anything more with that info from an ECU perspective, but I have no issues and just watch the ODO when I get down to that point.
 

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I have a 2012 FJ w/ 117k and just experienced this for the first time. Gas gauge hung up at right around 1/8 tank. No gas light. Engine stalled right as hit my ODO reading right when I would have expected it (I should have seen it coming!).

Filled up and the gas gauge now reads full. Will be interesting to see what happens as I drive through the tank of gas. Hard to tell from this thread if the problem repeats every time or is intermittent.

I am surprised that this appears to be a fuel level sender issue as I got accurate readings right up until it stuck at 1/8 tank. Seems like that would be more indicative of a float problem? For that reason I am hoping (probably foolishly) that somehow the gripe just goes away.

Previously someone asked if there was anything the float/sender assy affects other than the gas gauge itself? I.e. does the ECM use that information for anything? In other words, if one were to NOT fix the issue, and just deduce gas level via ODO and/or Ultragauge, will it damage anything?
Won’t heal itself ,unless you replace the float you just live with it ... you can drop the tank and replace the float or cut a hold under the back seat and access the tank
 

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Dropping the tank isn't that bad with a floor jack. If you have a friend that can assist you for few minutes to put it back up in it's really easy.
 

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My FJ die on me driving home on the freeway from work yesterday. Turns out the fuel float was defective, and it ran out of gas with 1/4 tank reading on the gas gauge. Just lettin everyone know, hopefully a fluke, but who knows.
My mechanic said my fuel sensor was lying. After he repaired it I never had any other problems. Toyota cost$100 bucks and didn't have any idea what caused it.
 

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Won’t heal itself ,unless you replace the float you just live with it ... you can drop the tank and replace the float or cut a hold under the back seat and access the tank
What's interesting is, I believe mine may have started reporting properly now, as I ran it low the other day and the fuel light did come on, etc (before it would run out of gas before it got to that point). I'm a bit gun shy to run it that low again knowing the gauge had been off by at least 1/8 tank to 100% confirm it, but it does seem to be reading more accurately now, so not sure what is going on... very strange. Bottom line though is I'll never push it over 300 miles on a tank just to be safe.
 

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A small bit of good news for those of us with this problem - mine appears to have self-corrected (at least for now). I first noticed the issue in roughly January of this year. Probably got low enough on gas 2-3 times during the Spring that I noticed the gas gauge would still stick at ~1/8 tank left (probably 1 gallon before the light should have come on). It would go back to full upon refueling and lower normally until the "sticky spot". I used a couple cans of Seafoam at some point (can't remember when) and mostly just relied on the UltraGauge. In September I got pretty low on gas and noticed that the gauge appeared to not be stuck. Took it down to where the light came on and voila - everything worked as expected. I've deliberately gotten low enough on gas to confirm proper operation 2-3 more times and all appears in order. Here's hoping that continues...but +1 for UltraGauges.
 
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