Originally Posted by
NSEU
Re the comments about seals....
The fuel is being pumped from the tanks under pressure (by wing tank pumps). Any leaks in seals are going to put fuel to atmosphere, not air to fuel lines. The wing pumps were working normally.
Not sure I follow you there. If there's a blockage upstream of the HP pump the pressure in the line feeding into it is going to go from positive to negative pretty quickly (the pumps cavitated for some reason - not enough pressure being delivered to them is a reasonable inference).