I'm just about to do mine as my after market tank surges like fuck lol
I'm going to use the set up on the car now 044 pump then filter to run into the boot and feed my 1.5L surge tank which will then feed a second 044 which will feed the rail got a 4 port -8 tank from eBay for 40 quid
I'm going to wire my second pump in on its own relay with a 12v battery supply just like the one that's on the car now but the relay will share the earth and ecu trigger wire with the first pumps relay! The pump its self will share the first pumps earth at the rear of the car