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Thread: petrol gauge

  1. #1
    Regular Member pitsmoor21's Avatar
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    Default petrol gauge

    Hi does anyone know how many ltrs each section of the gauge represents

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    Regular Member Ste's Avatar
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    Vehicle : Jaguar XF 3.0D V6

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    The tank is 60 litres, so if the gauge it truly linear, you can then just divide the necessary sections into it.

    I would doubt that the gauge is perfectly linear tbh. Maybe a little experiment is necessary? Next time you fill up from empty, stop at each section marker and check how much fuel you have dispensed into the tank = question fully answered.

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    Regular Member Stevie-B's Avatar
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    I would say there are too many factors to count for giving a reliable figure. Personally I fill the tank, re-set the trip indicator and when the low fuel indicator warning light statrs to flash I know I've roughly 5 miles left. I've worked out my 1.8 does 410 miles to the tank on average.

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    [Ex]Admin Duncan's Avatar
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    Quote Originally Posted by Ste View Post
    The tank is 60 litres, so if the gauge it truly linear, you can then just divide the necessary sections into it.

    I would doubt that the gauge is perfectly linear tbh.
    I would say the same i.e. the gauge is not linear based on seeing how it drops in cars I've had - including the Signum.
    Quote Originally Posted by Ste View Post
    Next time you fill up from empty, stop at each section marker and check how much fuel you have dispensed into the tank = question fully answered.
    Even that is unlikely to be of use due to the delay from putting in the fuel to it registering on the gauge as it's not instantaneous - so difficult to get it to settle on the section marker, unless you stand for ages filling it up a bit at a time! lol

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    Regular Member Ste's Avatar
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    Vehicle : Jaguar XF 3.0D V6

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    Engine : 3.0D V6

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    Yes, it would take a bit of time, but would absolutely answer the question.

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    Regular Member Hideous's Avatar
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    Vehicle : Insignia

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    They never seem to be very accurate at all, over the whole tank. I know on my vec, I can do 110+ miles before the needle goes past the first segment (an 1/8th of the gauge). I get 600 miles per tank, not 110x8 = 880!
    Generally, it seems to go down a bit quicker after it passes half empty. Beats me why nobody can make a 100% accurate fuel gauge yet

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    Full Member Big Sig's Avatar
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    Its all down to the shape of the tank is it not? Its not perfectly square ot anything, it has rounded corners and depending on the car the base may not be flat, its just not worth the development to get a gauge to reflect the tanks shape and the usage curve it would therefor represent on a linear scale....... I think!
    Now I need a turbo to keep up!

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    Regular Member opel_estate's Avatar
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    Vehicle : Opel Vectra C Estate

    Trim : Enjoy

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    Year : 2007

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    Couldn you just make a habit of heading to a service station each time the needle hits one of the markers, fill it up to the neck , and keep track of the results? ( that is, if you have nothing better to do )

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    Regular Member Ste's Avatar
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    Vehicle : Jaguar XF 3.0D V6

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    Tank geometry isn't really the root cause here, it's about how the sender signal is used by the car to display fuel level.

    If it's a simple resistance meter, then yes the tank geometry will influence the accuracy. If the signal is processed in any way, then the system (sender and gauge) can be calibrated to take shape into account and accurately display fuel level at all times.

    It comes down to dev costs and whether the inaccuracies can be minimised / lived with.

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