[jetboy]

Originally Posted by 92snowmachine

i would figure it's nothing to worry about. mine has been doing it for years. it's really intermittent so it's difficult to find the cause but i have theorized that it's the fuel coming out of the return line splashing against the side of the tank and swirling the gas when it's at just the right level.

Sounds very plausible. And it's perfectly rythmic with said interval?