7 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHUnusual fuel gauge reading
Leading reported evidence
Fill tank
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Suggestion
With my Turbo (which of course has the same fuel tank setup) I always fill the tank when I stop for gasoline, whether the tank is down just 1/4 or empty with the low fuel light on.
Leading evidence: 'Fill tank' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Fill tank' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Suggestion · Original poster
Usually it takes about $60 to fill the tank so it should have read about 1/3 full.
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Suggestion
It'll recognize & reset when you put in a LOT of gas, but not if you only put in a little.
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Fill tank
No successful repair reported for this finding.
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Reported fixes
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Unsuccessful attempts
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Discussions
Read evidence and context
Discussions that contain suggestions
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0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
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Suggestion
With my Turbo (which of course has the same fuel tank setup) I always fill the tank when I stop for gasoline, whether the tank is down just 1/4 or empty with the low fuel light on.
Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.
7 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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Generation: 20261026T183130Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
The following happened twice in the last week. The fuel level was near the empty mark so I went in to put $20 or 14 liters (3.7 gallons) into the tank. Started the car and the gauge reading remained the same. Usually it takes about $60 to fill the tank so it should have read about 1/3 full. So I put another $20 in and this time the gauge went up to 2/3 full (where it should be with $40 in the tank). I usually do a fill up but the gas prices shot up so high I just put in a little to get me through until the prices went down.
Today I did the same thing, and got the same results ($20 followed by the second $20). So maybe it's always done that?
Is this normal?
I'm guessing this is in your C4? If so, this sounds similar to how my car functions when I add a little fuel to a very low tank. The tank is shaped to fit around the front wheel drive components, so you don't get a "real" level reading below a certain point. The computer does some trickery to determine range when the car is below (I believe) a quarter of a tank.
Agree if it is the C4.
The tank has two basins that extend on either side of the front diff. The basins are not connected at their bottom, there is no crossover connection. There is a siphon jet in each basin to pull fuel from the basin.
When the tank level drops below 1/2 tank the OBC takes over and computes the fuel level based on how the car is being driven. If one doesn't add enough fuel to at least engage the real fuel level system the electronic one can't know how much fuel was put into the tank so the level does not change.
With my Turbo (which of course has the same fuel tank setup) I always fill the tank when I stop for gasoline, whether the tank is down just 1/4 or empty with the low fuel light on.
n'thing the "it's normal". Something to do with the algorithm the fuel level indicator uses to filter out sloshing, I think. It'll recognize & reset when you put in a LOT of gas, but not if you only put in a little. It should slowly correct itself as you drive, and might be showing accurately (or close to it) by the time you get to wherever you're going.
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