Thought a link was in the start post.

1.2-1.3 bar if memory serves. It's in my detailed fuel system thread. I think it's about 15-18psi. It will of course vary over the life of the electric pump as the pump weakens.

As far as the cause it's oversight on the designers part that didn't hold the o-ring from both sides.

If the fpr fails there is a relief valve to dump the extra fuel directly to the right tank. It's labeled on my fuel system thread

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)