Quote:
Originally Posted by jcaserta
I added gas before sunday runs since the light was on but it didn't move the level. Then I added a bit more before the challenge, still reading below E. Then midway through the challenge added even more just in case. Even with that I was convinced I'd run out of gas at any moment, especially by the time I ran against you for 3rd place. Then added even more before my tuesday tnt runs, still no movement. Thankfully a little later on tuesday finally it updated. Over half a tank lol. So I ran nats (and I guess the challenge) with more gas. Oh well.
Now I'm wondering if my fuel gauge is wireless and it was reading your fuel level the whole time 
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Quote:
Originally Posted by strat61caster
We learned that lesson at Lincoln last year lol, renfield explained it, unless you throw about 3 gallons or more in the tank at once it doesn’t register as a fillup and keeps calculating fuel level based on consumption (I assume to minimize the needle bouncing around it rarely takes a real level reading). Guess it prevents getting a false level if parked on a hill or something? Idk. But yeah if you’re adding 1-2 gallons at a time the gauge will keep going down until you add about 3 gallons at once, might be able to get away with 2.5, I haven’t gotten scientific about it.
We panicked and did the same with an overfill halfway through the pro I think last year.
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It's definitely some kind of sloshing/uneven ground safety mechanism and it's a total trip running an event with the meter at negative quarter tank. You need to track your fuel consumption across an average 60s course. Once you hit the fuel light you have ~2 gallons and it won't re-adjust until you add 3 gallons. So if you add a gallon after every 3 runs you're usually good to go from there.
And to clarify - It's not an "at once" thing. You can add a gallon, take a run, add a gallon, take a run, and then add another gallon and it'll update. It has to come up a certain amount below the level it thinks its reading at before it'll believe itself. I haven't figured out what the trigger point for when this behavior kicks in is yet but it's at least below 3/4 and above 1/8 because you can throw in gas at near full and it'll update immediately.