I just had my sending units relaced as I was having the same issue with my gauge not lighting all the way when I would fill up. I have only used Chevron gas which has the Techron additive but I had the same issue with my G35. I even us e the Techron Fuel System with Techron at each oil change to help prevent it from happenign again, but there is no guarantee. Simply have the dealer replace them. There doesnt need to be a TSB for them to do so. If it's not working its not working, period.
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