quick question, is there supposed to be a vacuum hose attached to the fuel pressure regulator on an 08 roadstar? i cant find any vac line diagrams. thanks Brad
If you're inquiring about the nipple noted, then, no.
The only time the nipple is used is during diagnostics. A vacuum/pressure type hand pump, with a gauge, is attached there to monitor pressure regulator changes and see if they are in spec.
The hand pump #5 attached to the regulator #6 for tests purposes only..