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I had the same problem for five years or more. The local shop cleared all the vent lines and I installed a new non-vented cap to no avail. Bought a new stainless steel tank and the problem went away. My old tank, for some reason unknown, was bulimic. Trouble free for the last few years with...
There is a good article in the current April 2018 Mopar Muscle magazine about obtaining the correct A/F mixture on a Hemi. May not apply directly to your case, but it is very informative.