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A few thoughs to be helpful.
If you can set up a voltmeter to measure the volts across the pump it will confirm if you have a problem with wiring (or a connector). If the volts drop across the pump when it is flowing lots of amps, there is another source of electrical resistance between the pump and the Bat/alternator.
I'm also guessing you have a genuine 044 from a known seller? Apparently there are copies on Ebay which look good but don't perform.
Is the supply to the pump (pipe sizes and tank port) big enough? A fuel pressure sensor at the 044 input would show if there is always positive pressure at the input. If the 044 has to suck the fuel at high flow rates, the output pressure would drop.
good luck!
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