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Vac lines will not help you with 4580, 4530 they will but not 4580. Most likely your fuel flow control valve on the high pressure fuel pump. It’s not s bad part to replace. About $100 of you get a Bosch part and not a BMW branded one. Three torx bolts. You can do without removing the manifold if you got long enough torx bits.
Last edited by Yozh; 02-11-2019 at 01:31 AM..
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