Collapse the tank?!?!? Geeze.

The wagon has a rubber neck between the filler and the tank. That thing should collapse and blow before the big steel tank gives up the ghost.

Unlike the sedans, the wagon does has a vapor hose that routes from the filler neck up and down through a grommet in the floor of the side compartment. I was going to plumb all that up with the vapor cannister, but have not done so yet. I'd think that would be sufficient to relieve the implosion risk you're describing... But it may not be enough to avoid the problem.

So, given that, I should be able to just remove the fuel cap and (assuming nothing else is wrong) see fuel move through the system.

Is it your understanding is that the PSIs are maintained between the pump and the FPR? Approximately 30 PSI is what I remember reading...