Apparently you need to set up a return line somewhere upstream. A good option is fuel filter of VW/Audi/Skoda (last gen, fsi and tfsi engines) which has built-in regulator and is cheap. It comes in 2 sorts with regulators set to 4.0 bar and 6.3 bar. You need 4. That's a bit higher than factory 3.3bar but still ok to go for its simplicity
Another option is sourcing 2UZ fuel rails which have regulator and return line. They run at 3.0 bar which isn't way too bad either.
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