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3.0d only priming intermittently 3.0d only priming intermittently
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  #11  
Old 05-24-2020, 03:55 PM
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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.
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  #12  
Old 05-24-2020, 04:58 PM
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New doesn't mean fixed. You need to verify that the in tank pump has power or not.
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Old 05-24-2020, 05:12 PM
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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?
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Old 05-24-2020, 05:45 PM
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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.
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  #15  
Old 05-24-2020, 06:46 PM
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So possibly it’s the inline pump that’s at fault?
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  #16  
Old 05-24-2020, 06:53 PM
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Quote:
Originally Posted by Kshamm View Post
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.
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Old 05-24-2020, 06:54 PM
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Quote:
Originally Posted by Kshamm View Post
So possibly it’s the inline pump that’s at fault?
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
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Old 05-24-2020, 06:57 PM
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Originally Posted by Clavurion View Post
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.
haha - snap!
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  #19  
Old 05-24-2020, 08:03 PM
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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?
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Old 05-24-2020, 08:14 PM
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Originally Posted by wpoll View Post
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
That is steep. Here in Europe I can get a new Pierburg for 130€.
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