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post #1 of 5 (permalink) Old 29th June 2006 Thread Starter
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How much is left?

Can anyone give me a clue to how much diesel i would have left when the warning light comes on
I have a scenic dci the gauge is through the red but the lights just come on. The trip computer recons i've used 10 gallons and still have enough left for 60 miles. How accurate is the trip computer or the gauge?
being a new scenic owner i'd love to get an idea how much fuel roulette I can play.

Rules of fuel roulette are: wait until the computer reads 0 the light is on and the neddle through the red. then see how many petrol stations you can pass! if you make it home let you wife drive the car the next day.....she'll always fill it up!!!
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post #2 of 5 (permalink) Old 29th June 2006
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Hi Ian I have a petrol scenic II so I'm no use to you sorry although the point you made about the wife filling it up is true my hubby doesn't know where the garage is I am sure he would be able to tell you all about petrol roulette

You know you've spent too much time on the computer when you spill milk and the first thing you think is, 'edit, undo.'
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post #3 of 5 (permalink) Old 29th June 2006
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I used to cheat at petrol roulette - I'd never play without a spare can of unleaded in the boot.

I've not run this one dry yet, but I used to be able to run the 2.0 IDE out of the bottom of the red. I only ever ran it dry once - unlike older cars (where you get a bit of a 'chug chug' warning before it cuts out) I got a fuel injection fault up on the display and had to pull over immediately. I never took a chance on running it dry after that.

There was a time when you needed to avoid running diesels dry, as the systems needed re-priming. Modern diesel engines are supposedly self-priming, though you might have to crank for a while to get it going.

Though the same problem no doubt applies to both petrol and diesel - when you run the tank dry, you suck all the crud that's accumulated in the bottom of the tank into the fuel filter. If you're lucky, it'll have no ill effects, or the car will just run rather rough for a bit (my white Lag I was a dog for a day after running it dry but cleared up on its own.) If you're unlucky, it'll cost you a replacement fuel filter.

If you're not already on 'fuel low' you should be able to get an indication of the number of litres remaining using the trip computer diagnostic. Well you certainly can on the Lag 2 and Clio 2. Hold the trip computer button in while turning the ignition key to the accessory position - the speedo and other dials should start stepping up and down. Press the trip computer button repeatedly and you'll get a number of meaningless readouts. One is not so meaningless, it's the number of litres of fuel left in the tank.

Though bear in mind that even this isn't going to be 100% accurate. It's as close as you're likely to get though.
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post #4 of 5 (permalink) Old 29th June 2006
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From bitter experience I can tell you that when the needle gets to the bottom of the red bit, it really is empty!
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post #5 of 5 (permalink) Old 30th June 2006
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My megane low fuel light comes on with 10 litres in the tank, thats loads of miles. At that point the trip also records fuel as being nil.
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