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you might need to check the relays in the fuse box, without forgetting the fuel regulator.


I think that something blocking fuel lines, maybe hose bend. After some time under pressure of fuel pump it unblocks and fuel rail pressure returns to normal. Not sure that ECU has fuel pressure sensor, so it is just a theory but it worth to check fuel pressure first


BMW's plan was for it to never be changed. Looking at some of the forums, I think advice given from this BMW site seems about spot-on: Well-l-l, I hate to say "never" but the point being, one often needs/wants to crack open & rebuild an engine for other reasons (ring/valve wear, main seals, etc.) by a quarter-million miles or so--at which time, check ...

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