airfoilmod,
apologies for the misleading wording.
There are two pumps in the engine, one low pressure, that ensures uninterrupted feed to the high-pressure pump, and often, as shown in the
diagram posted by Jet II here a while ago, also pumps the fuel through the fuel/oil heat exchanger and the low-pressure fuel filter.
Some mentioned that the AAIB was concentrating on the FOHE as the location of a possible fuel blockage; this would be consistent then with the engine LP pump not showing cavitation signs, because (at least in the diagram) the FOHE, and thus the blockage, would have been downstream of the (engine) LP pump.
Bernd