When my cube was still brand new I noticed something related but different: the fuel gauge would read full soon after I fill up but then within 5 miles it's already gone down a bar (and then went down normally after that). After talking to my mechanic at the dealer, he opened it up & noticed nothing wrong with the fuel sensor. However, he said that sometimes some cars are sensitive to pumping pressure which can affect the reading on the gauge. So basically he suggested that whenever I fill up I should keep pumping by hand until I cannot put any more gas in there (I normally let the pump go auto until it shuts off, then I pump by hand until i can't pump any more - which normally results in 1.5 more gallons beyond the auto shut-off). Since this change, my gauge reads full for a reasonable amount of time which corresponds with my current mpg rating. I don't know if this helps you at all, but it might help someone else.
|