whunter - I think you're onto something. I'll watch that line too. Yes, my tank breaths a sigh of relief when taking off the cap. Time to unplug the vent!

Fingers crossed for no damage due to extremely overfilled crankcase! RPM's were never above 2k, ran for only 3 min . . .

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1986 300 SDL, gray on black, #14 head, 180K miles
1982 300 CD, silver on palomino, 290K+ miles [sold]
1980 300 SD, white on palomino, 500K+ miles when retired [uncle's car - inspiration for the above]