I haven't seen the lower of our engines personally but looking at the service manual it looks pretty typical. There is a bolt where the tube goes into the pump (where the o-ring is) but there is also 2 nuts that hold the pick-up tube for support midway of the block. In my thinking those 2 nuts would have to come loose also for it to completely lose pressure, along with the bolt that tightens the end of the tube to the pump. I would think there would still be enough upward pressure from those two support nuts to hold the tube to the pump.
I don't know what to think about the driveway deal though. I look forward to hearing the answer.
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