Quote:
Originally Posted by mid_life_crisis
I'm convinced there are production tolerances that explain why some do it and some don't. Mine had it. You could hear it with the windows up. Pump was replaced a few thousand miles ago and now, once in a while, you can just hear something with the windows down. It explains why replacements took care of it for some but not all.
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That seems very likely.
My theory is fuel additives. It seems like I get them after running 1/4 tank of gas from some stations (then have to deal with it until the next fillup) then after using 1/4 tank of a fillup from another station it goes away. I hope to test this theory on a 3,500 mile road trip in September.