Hi Steve,
I'm also using a carter low pressure pump and a 044 high pressure pump. I've had no preblems (except for the time I almost ran out of fuel
)
From my limited knowledge I would suggest your 044 pump might be to blame. The pump requires fuel to lubricate it. It might have run too dry while you were sorting out your fuel pump wiring or just turning on ignition while sorting out other wiring issues. I was warned not to use it dry. But given the pumps only operate for 2 secs when on ignition it can be easy for forget about it.
Cheers