I have changed the in tank pump and the symptoms are still the same. I also changed the fuel pump relay and that did nothing.

New doesn't mean fixed. You need to verify that the in tank pump has power or not.

Can you please explain how to test then? I put a multimeter in the power coming into the top of the in tank pump (disconnected the plug and tested) and it was reading ok. Is that how u would test?

And fuel supply should work normally even without in tank pump if tank is more than half full. Inline pump (if working normally) has enough suction as long as there is fuel on the right side of the tank.

So possibly it’s the inline pump that’s at fault?

Yes, a strong possibility. Pierburg 7.50051.60.0 = OEM. If you renew the pump renew the fuel filter too because it's just beside there and the main job is to remove the bottom cover to get there.

Quite possibly - I have heard of them failing. Usually a total failure though - not like yours. Maybe check the wiring to it...

They aren't cheap... here's a decent price for an OEM unit on eBay.

https://www.ebay.com.au/itm/BMW-E38-...0/174041869019

haha - snap! :thumbup:

Ok. Great. Thanks for the help. I changed the fuel filter when the problem first started but that also didn’t do anything. No one has mentioned the fuel rail pressure sensor? Is it possible that is causing the issue?

That is steep. Here in Europe I can get a new Pierburg for 130€.