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that definately should not be able to happen... sounds like something is kinked in either the rollover valve hose or the vent tube (or both!). Plus, given that gasoline has a relatively high vapor pressure (hence the warning about spray on the fuel cap) it doesn't seem likely that there is vacuum forming, but it's definately possible... I'm thinking I might start by replacing the cap... seems to me that there was a post a while back about this exact problem, and changing the cap solved it. While you're at it, you could upgrade to a locking cap for a whopping $20... that would eliminate that from the equation... I'd still look real closely at the vent tube, though... it could be obstructed or kinked someplace preventing the tank from breathing.
Question... when you crack the cap with the engine in its sputtering mode, does it get better immediately?
-Joe-
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'00 F-150, X-cab, 4x4, Lariat, 5.4L Off-road, Trailer Tow, Holandia Sunroof($1000)Mucho mods
98 Explorer bone-stock (Lemon Law Case in Progress)
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I'm not smart, just a resourceful idiot with some spare time.
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