Ya.... been there done that. Was the first thing I cleaned. Although the tank and wires were clean at the start by appearance. After cleaning I had the same issue. Showing over half a tank yet the reserve light would kick in. No change.

But after this solder work, its behaving MUCH more accurately. And its not jumping nearly as much. So something with the soldering sure had an effect on it.

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1991 560 SEL / 185k miles
1992 750il / 17k miles - project car