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Originally Posted by porsche986spyder
Not according to this FAQ page I found. This is what it says.
Gas Gauge Out of Calibration
Diagnostic: The gas gauge on the dashboard reads low even when the tank is filled.
Cause: Miscalibrated gas gauge.
Details: The gas gauge can be calibrated using the PST2 (Porsche System Tool 2). The gas tank must be completely drained. Then a precise amount of gasoline is introduced into the tank. Then the PST2 is used to calibrate the gauge needle.
Time in Shop: One hour.
Repair Instructions: Requires dealer repair.
Notes: None.
I copied this straight from the board. This sounds more like what he is experiencing. Tank shows a low reading and then later slowly rises to correct level. I had the same problem. It is very common in older boxsters.
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Hi,
Sorry, is it possible for the Fuel Gauge to be out of calibration? Yes - definitely. But, if it is, no amount of waiting is going to automatically, or mysteriously, recalibrate it.
On the other hand, if you have a loose overfill tube obstructing the movement of the Fuel Sender Float, after you drive around, the tube moves again, away from the float allowing it to rise as designed, and the gauge then reflects the proper fuel level. This is what it sounds like the lister is experiencing...
Happy Motoring!... Jim'99