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long time gas gauge problem, help?

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Newbie here, and I have had a 00 2.7 box for a couple of years now, and finally want to track down an issue with the gas guage. When you fillup everything goes ok, but the gauge drops to a 1/2 tank full reading very quickly, then goes really slowly for the last half tank. The correct amount of fuel goes in at fillup, and the correct distance of miles gets driven for the full tank, but the gauge seems to drop at an "nonlinear" rate.

Anybody else have that happen??


Monte in Sandy Eggo :welcome:

BTW finally doing the 3.4l conversion!! Looking for the engine as we speak... wish me luck!

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I have an '01 2.7, and my gas gauge also goes MUCH faster over the first half tank than the latter half. I filled up yesterday and drove 10 miles, and it had already dropped to 7/8ths.

I've got a '01 3.2 S and the gauge hasn't registered the same way twice following a fill-up. Sometimes full, sometimes almost full. Yesterday I topped off with a half tank indicated by the gauge. The gas pump indicated about eight gallons before auto-shutoff. Upon leaving the station the gauge still indicated half full. Eventually it creped up to about seven eights full. It does seem more linear then noted in previous comments. I've only owned the car a little over a month, about four tanks of gas.

I might mention the car's had to visit the shop (Porsche, Newport Beach, CA) four times. Auto seat cable problem; 45K mile service, front brakes + brake fluid change; and last but not least a flat bed trip for smoke pouring out the back end & oil leaking out the bottom of the engine. Cure was oil separator. At one point I was getting engine check light, SAI (left & right engine bank) which the dealer was not able to determine cause. I bought a pocket tester to check & reset the error (if same) and will wait until a more solid error is exhibited.

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