F21 2015 LCI M135i fuel leak

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LondonMark
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F21 2015 LCI M135i fuel leak

Post by LondonMark »

I have now found the source of the fuel leak. Fuel is only leaking when the engine is running. Fuel is squirting out from what looks like a spare nipple/nozzle on the top of the fuel pump that is located under the rear seat in my 2015 F21 LCI M135i. The BMW fuel pump part number is 7243975. Should there be a hole on the top of this nipple? What is this nipple for? Has anyone else had this problem? Do I need to replace the whole fuel pump? All knowledge much appreciated. I've attached a photo showing the fuel squirting out (centre of the photo, to the right of the electric connector). Cheers :D
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Simon Site Manager
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Re: F21 2015 LCI M135i fuel leak

Post by Simon Site Manager »

Hi Mark,
I have tried to find a schematic of the pump, to no avail are there 2 fuel lines running to the pump?
'17 M140i Estoril Blue Most of the toys. Every time I see an F40 it makes me :(
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Simon Site Manager
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Re: F21 2015 LCI M135i fuel leak

Post by Simon Site Manager »

i reckon a hose has popped off (I belive the 135 & 335 use the same lpfp).

https://www.realoem.com/bmw/enUS/showpa ... Id=16_0601
'17 M140i Estoril Blue Most of the toys. Every time I see an F40 it makes me :(
LondonMark
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Re: F21 2015 LCI M135i fuel leak

Post by LondonMark »

Simon Site Manager wrote: Thu Nov 25, 2021 1:00 pm i reckon a hose has popped off (I belive the 135 & 335 use the same lpfp).

https://www.realoem.com/bmw/enUS/showpa ... Id=16_0601

Hi Simon - Many thanks for your reply. Apparently there isn't a return fuel pipe on the 1 series (or F-series). I've looked at several videos on YouTube showing how to replace this fuel pump, and none of the videos show a return pipe, just this odd nozzle not doing anything.
Here's another photo, it looks, and feels to the touch that the end of the nozzle has broke off, plus one of the YouTube videos.
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Simon Site Manager
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Re: F21 2015 LCI M135i fuel leak

Post by Simon Site Manager »

New bit of kit then?
'17 M140i Estoril Blue Most of the toys. Every time I see an F40 it makes me :(
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