If you have to use vice grips, I'd put a bolt in the top of the dip tube to avoid crushing the tube flat. Grip onto the bolt over the tube. First try and dislodge it while the motor is cold, then apply the penetrant and try again later. If that doesn't work, get the motor hot and apply more penetrant and pull it out hot. Wipe off excess penetrant overflow, might be flammable in a heat zone.
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