PART 2: FUEL PUMP MODULE
Subaru PN: 42021CA000
OE PN: 291100-0090
The module (aka bucket, aka assembly) is fairly standard in size, shape, and design. The BRZ fuel system appears to be returnless because there is only one outlet on the module (see pics). There is an internal regulator that keeps the system pressure a constant 4 bar (58psi), which also indicates a returnless system. I am not aware of another manifold referenced regulator anywhere else in the system. There is also a post fuel pump filter integrated into the module. Both the pump and internal regulator are held into place with a special pre-filter (aka sock) that has integrated clips. Fuel pump modules often have an effect on flow rates. Therefore the OE pump was flow tested both installed into the module and outside of the module. See the report for detailed flow results.
BRZ module – assembled (side view)
BRZ module – assembled (top view)
BRZ module - opened