hahahah lol.
i had the EXACT FREEKIN PROBLEM.
it was ok then it would start making this bouncing noise. and the fuel presure was bouncing up and down.
they dont like the hi/low fuel pump voltage.
the first thing you need to do is to piss the fuel pump controller off.
(find the earths for the pump and ground them directly to the body)
also run a direct power line from the relay to the pump aswell.
located behind the boot latch area.
if that doesnt work throw it in the bin and get an 044.