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car feels slow when the tank is full?

My problem is when my tank of fuel is full - my throttle feels really sluggish and slow. But when the tank is almost empty throttle feels VERY sensitive (like

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Old 12-23-2011, 03:41 PM   #1 (permalink)
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Default car feels slow when the tank is full?

My problem is when my tank of fuel is full - my throttle feels really sluggish and slow. But when the tank is almost empty throttle feels VERY sensitive (like it should be from the factory, I guess). And it is not because of the additional fuel weight, if a big friend of mine sits in my car when the tank is almost empty - throttle is still very sensitive

My only guess is fuel pump, as I cleaned it several times (here we have very dirty gasoline sometimes), but I can't imagine why

Maybe it is somehow connected with the self-learning ecu?
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