After recently upgrading fuel system with surge tank and dual 044 type pumps had excess fuel pressure, with battery at 13.3v and engine not running was getting 70psi and 370lph (97gph) from return line, once engine was running pressure was reading 84psi.
Decided an External Regulator was required, was hesitant to simply fit an external regulator with return and feed line to Throttle Body as wanted continual flow through the Throttle Body, also did not want fuel having to pass through two regulators.
While researching options came across this Fuel Rail Adaptor which suits the Bosch Regulator Port, which then allows Fuel to pass through an External Regulator capable of high flow systems, my choice of Regulator was a the Turbosmart FPR1200 which features -6 Ports.
The Adaptor is listed to suit Audis & Ford Falcon XR6 Turbo when using the stock fuel rail, the latter Ford Inline 6 has quite the following here in Australia as capable of some substantial power. The Adaptor has dual 1/8” NPT Port, there are multiple companies making this Adaptor they are as below.
The Fuel Regulator Retainer would not fit over Adaptor so had to modify it so that it slides down over one Adaptor in place, then found the M5 Socket Heads Screws clashed with the 1/8”NPT-6AN Adaptors, so had to further modify Retainer to suit Countersink Screws.
Adaptor directs fuel to Regulator then back through itself, by angling the AN Fitting just right was able to get Air Filter Base back on.
Conducted a flow test with new setup, at 13.3v & 58psi managed to flow 440lph (115gph).
Heading back to Dragstrip this weekend, should be end to fuel starvation issues.