DV, if Techie101 had answered your question he would deserve your thanks. But his general statement is rubbish.
All fuel lines, pipes, joints, seals and anything connected to them are checked at 50 PSI, whenever required.
However, with respect to the refuel pipes and AAR pipes, they can be tested to 50 psi.
Handjob
Yes there is. Happy now.
YES
YES
NO
Definitely not
Wouldn't think so but you'll believe what ever suits your agenda irrespective of the truth.
I already knew the answers to my questions (you failed the quiz) Its just my way of steering this thread away from integral fuel tank leaks, and towards where the clues are pointing.
No hard feelings.