I had this exact problem on my 87 325i, its was a leaky injector causing 2
it would slowly flood the engine, also, when cranking you will have to build
fuel pressure right up again. I replaced the injectors and the problem went
Could also be old/cracked rubber fuel lines. replace them if they look bad.
Just get some
8mm hose rated to atleast 3 bar and its any easy fix.
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