9 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHProblem with Fuel Gage Reading
Leading reported evidence
Disconnect over an hour
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
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Performed · outcome unconfirmed · Original poster
A day later I was working on the car and had the battery disconnected for over an hour.
Leading evidence: 'Disconnect over an hour' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'calibration issue' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Disconnect (2 hours)' (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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Performed · outcome unconfirmed · Original poster
I found a post by M Engineering dated 7-31-2023 that explained that the later Porsches used a procedure that used the fuel level sensor to indicate only the upper ⅔ of the tank level and uses a calculation for the lower ⅔.
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Performed · outcome unconfirmed · Original poster
I found a post by M Engineering dated 7-31-2023 that explained that the later Porsches used a procedure that used the fuel level sensor to indicate only the upper ⅔ of the tank level and uses a calculation for the lower ⅔.
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.
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Suggestion · Original poster
I found a post by M Engineering dated 7-31-2023 that explained that the later Porsches used a procedure that used the fuel level sensor to indicate only the upper ⅔ of the tank level and uses a calculation for the lower ⅔.
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9 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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Generation: 20261026T122219Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
I have a 2000 996.1 C4 Cab 6-speed. I have a problem with my fuel level gage reading. I started a recent trip and my tank was about � full. When I got home the gage was below � but not close to empty. I don't remember exactly. A day later I was working on the car and had the battery disconnected for over an hour. After reconnecting the battery I noticed the fuel gage was very near empty. (The trip odometer was also zero.) I was surprised because I didn't remember it being that low. I went and completely filled the tank. But it only took 9.8 gallons. So based on having a 17.0 gallon tank, my fuel level before filling was 7.2 gallons (42 %), not close to empty.
So I figured my fuel level sensor was acting up and I started looking at fuel level sensor posts on the forum. I found a post by M Engineering dated 7-31-2023 that explained that the later Porsches used a procedure that used the fuel level sensor to indicate only the upper ⅔ of the tank level and uses a calculation for the lower ⅔. He thought this method may go back to the 996 models. If this is true, my tank was probable under ⅓ full when I disconnected the battery, causing the level calculation to reset to empty. If true, I may not actually have a fuel level sensor problem. Can anyone confirm this?
I have the same issue with mine. Seems to drink fuel like crazy but then I go to put gas in it and it bounces up to full quickly. I guess I've always pull over once the reading was under half just incase.
Its most likely a calibration issue. There r threads on resetting everything. U can also search the 6-turbo forum as they all have the same saddle tanks as the 4's.
I thought I read somewhere (here) that with the saddle tanks - the sender only goes to about half way down - and the rest of the travel for the gauge is calculated by the DME/ECU/Computer (pick your name for it).
-Tom
Maybe ask E30rapidic because I think he recently solved this and might still remember how. It took a little work but he says he got it right. I know I need to do mine too.
Yes the AWD fuel sender only works from full to 1/2 and the DME/instrument cluster guess at fuel consumption below that. Loads of fun on a track....
Anyway if you disconnect the battery below 1/2 tank it loses it's memory and shows something wacky. After filling it up that should clear up. You might just run a tank of fuel to confirm it is back to normal. Watch how far you drive to make sure you don't run out.
Calibration issue.
One way to fix is to fill the car all the way up, disconnect the battery, wait 5 mins, reconnect. If the fuel gauge shows full, you�re probably good.
I did the battery disconnect (2 hours) with the tank full. Everything looks ok. I will keep a close eye on it.
Thank you all for your great comments and suggestions. I haven't had the car that long and I am still learning.
No worries at all, it happens a lot with the fuel on this car.
Just a couple weeks ago, in a hurry, I filled up 2 gallons when I was on E and of course, the fuel gauge still showed E (it didn�t move).
I always reset my trip computer when I fill up now just to have a 2nd measuring device, lol. I can rely on 17mpg city, which is 289 miles on a 17-gal tank (worst case).
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