Well I can tell you for a fact that a sender from a "Saloon" is definitely not linear. I dont know if its the same for a VAN, but mine starts at 40 ohms at empty, and runs to 240 ohms at full. If you measure the same values at empty and full then maybe both cars use the same sender.
The graphic plot of my sender looks similar to a hyperbola, the sender is probably made that way to match the variations in the volume of the tank. I would not be surprised if the VAN is the same!
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