Date: Wed, 23 Feb 2000 23:41:00 +0100
From: Robert Brown <rjbnopsamnetNOSPAM.se>
Subject: Re: '91 9000 Fuel Computer.


We have a 9-3 and were wondering the same thing. What I finally did was note the mileage at the point that the yellow fuel lamp came on, regardless of the DTE (distance to empty) figure. We then stowed 5 litres of petrol in a can and drove around until it conked out. That of course gives the distance from "yellow light" to "really empty", which we recalculated in litres. We also got "check engine" for quite a few miles afterwards, so I found myself wondering if I'd have to pay through the nose to get a Saab tech to reset that, just for running out of fuel. But it reset itself ... Once we'd tired of wasting our lives by sitting on the side of the road with the pocket calculator, we used the reserve can to get us to the nearest filling station, filled both the petrol can and the car and that gave us the real capacity of the tank. Then of course petrol pumps don't all behave the same, some have auto-shutoff that kicks in earlier than others . . . What we finally decided after all that was we really didn't give a stuff what the capacity is - nowadays we just fill the damn thing whenever it tells us to ;-) After that rave, I'll answer you below: Pete Turier wrote: > Does anyone know how accurate the dashboard Fuel Computer is supposed to be > on a 9000. I understand the Fuel Tank capacity on a 9000 is around > 60litres, and yet when I fill the tank I can never put more than 44 litres > in. At this point (before filling) the computer says that I have enough > fuel left for around 30 miles, about 5 litres. Can anyone explain what's > going on? My guess is that at the point you're ready to fill, you have 15 litres left - the 5 the computer says you have, plus 10 more for good margin so Saab never get a bum rap for underestimating the amount of fuel left in the tank, causing you to run out in the middle of the desert or wherever. > How does the computer measure the fuel left in the tank? If it's > from the gauge sender unit, that must render the calculations next to > useless! > > Pete. > Gloucester > UK > 9000S 2.3 Turbo.

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