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OP said he would get random warning even after just filling the tank. Would also like to know why that would happen.
Some background:
Car has a saddle tank. Right side has fuel pump plus a level sensor. Left side has level sensor module only. There is a transfer tube which allows pump to move gas from left to right. the car empties left side first, then right.
There is obviously some kind of logic the car uses based on the two level sensors so the pump knows what to do. The repair manual does not go into detail how this works. Maybe this system is so common with saddle tanks that it does not deserve special description.
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