15 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHPetrol gauge not restting
Leading reported evidence
Replace sender unit
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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Performed · outcome unconfirmed
turbos , C4 then there is a calibration routine that needs doing with an incorrect or replaced sender unit.
Leading evidence: 'Replace sender unit' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'probably fuel capillary airlock in the sender' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Check of sender resistance' (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.
Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that performed work without a confirmed outcome
1
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Performed · outcome unconfirmed · Original poster
I ran the fuel in my C2 a bit low (fumes) and when I filled it up it didn't go back up to full.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that suspect a cause
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Suspected cause
This issue is probably fuel capillary airlock in the sender.
Outcome qualification: Negation, uncertainty or missing explicit repair resolution overrides the raw extraction signal.
Check of sender resistance
Suggestion or failed attempt
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
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Discussions
Read evidence and context
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that contain suggestions
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Suggestion
either way its an investigation and a check of sender resistance .
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that contain suggestions
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Suggestion
996 C2 just uses a rod with a float attached to a potentiometer , so im not sure how you can get an airlock ?
Outcome qualification: Negation, uncertainty or missing explicit repair resolution overrides the raw extraction signal.
Coverage and how to read this overview
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.
15 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
911uk: 1 discussions
0 evidence records excluded for query context · 0 excluded by outcome qualification · 1 adjusted by outcome qualification.
0 acknowledgements have no verified action link; they do not establish a repair result.
Generation: 20261027T150039Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
I ran the fuel in my C2 a bit low (fumes) and when I filled it up it didn't go back up to full. It is probably about half full on the gauge.
I'm sure there is thread about this, but I couldn't find it. Any ideas?
Assumeing you filled it to full then the sender has stuck .. maybe drive over a few potholes it might free off .. but i think you will need the sender checking as it may have fouled on the pump pipes and got stuck.
That's sufficient to register the quantity. If you put small amount in, owing to the shape of the tank, it doesn't reach the sender. That's not the case with filling it in your case.
You are probably thinking of the AWD fuel tank.
This issue is probably fuel capillary airlock in the sender.
If the fuel drops below the bottom of the gauge capillary, you get airlocks (and measurement).
Fortunately, overnight park-up or continued use will clear it.
Yes I was thinking of AWD with the saddle tank. Thanks for the clarification.
I think there must be many 996 Turbo owners who have had the initiation ob a petrol forecourt. I experienced it, so worried, I rang Mike at Sports & Classic and he put me right and told me not to put teaspoons of petrol into the turbo!
Could i humbly ask a question as im a little confused ...
fuel capillary airlock .. that would be in an enclosed float lvl sender or a system where by fuel raises through a pipe to operate a rod / potentiometer ..
996 C2 just uses a rod with a float attached to a potentiometer , so im not sure how you can get an airlock ?
Ive seen them get stuck on the pump pipes and will register only half full when actually full but dont understand this .
If i dont ask ill never know
I'm stuck with a similar problem after filling up from 3/4 empty (£100 at current prices). The car's a 996.2 C2 and the fuel gauge is still sat at 1/4 tank after driving it home 15mins.
Any ideas?
I suggest tapping the instrument cluster, it won't do anything but it has proved therapeutic for me until I find a solution to my same problem.
My 996.2 goes in for a service in a month so i will ask them to look into it and share whatever findings come from it.
Basic rule of thumb here ..
If the car has a saddle tank .. turbos , C4 then there is a calibration routine that needs doing with an incorrect or replaced sender unit.
This is because the saddles are lower than the fuel lvl sender can see and the car calculates the amount left using various parameters .
If on any car there has been work done on the fuel tank .. sender or fuel pump removed or replaced you have the possibility of the sender rod and float catching on a pipe from the pump ..
Basically the pump is on the bottom of the fuel tank with the sender above it .. the pipes and wiring from the pump go upwards to the sender unit .. it can snag on refitting .. you can't see if it does this when fitting .. bit of a pain but it can happen .
If suddenly the gauge is incorrect .. this could be a fault with the sender unit or the instrument cluster .. i don't think there is any calibration for a non saddle tank but there might be .. either way its an investigation and a check of sender resistance .
