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Re: Fuel Tank Leaking Mon Sep 05, 2022 6:55 pm
Rick G

admin

That picture is of the early type you will find the correct O-ring from 86 onward. I cant recall the size but Real OEM will give you the size.
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"Man sacrifices his health in order to make money.
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Re: Fuel Tank Leaking Sat Sep 10, 2022 12:58 pm
robmack

Life time member

RealOEM doesn't list the size of the O-ring that seals the fuel sender unit. I checked the Canadian price for the original BMW part and BMW want $23.00 plus HST. For an O-ring!! Highway robbery!
As far as I can tell, the correct size metric O-ring should be 4.5x45. That has a cross-section of 4.5mm, OD of 54mm and ID of 45mm. This is eye-balling it; can anyone else confirm?
As far as I can tell, the correct size metric O-ring should be 4.5x45. That has a cross-section of 4.5mm, OD of 54mm and ID of 45mm. This is eye-balling it; can anyone else confirm?
__________________________________________________
Robert
1987 K75 @k75retro.blogspot.ca
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Re: Fuel Tank Leaking Sat Sep 10, 2022 3:24 pm
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Re: Fuel Tank Leaking Sat Sep 10, 2022 4:52 pm
duck

Life time member

There's no spec for that torque in the BMW manual. Just get them nice and tight.
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Current stable:
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Re: Fuel Tank Leaking Sat Sep 10, 2022 5:51 pm
robmack

Life time member

Laitch wrote:Euro Motoelectrics confirms.

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Robert
1987 K75 @k75retro.blogspot.ca
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Re: Fuel Tank Leaking Sat Sep 10, 2022 6:37 pm
robmack

Life time member

FYI: Found a good source for these O-rings on Aliexpress. 5.0mm CS instead of 4.5mm, but they are Vitron which is good if you're using E10 fuel.
Search for this title "CS 5mm OD16-100mm Green FKM Fluorine Rubber O Ring O-Ring Oil Sealing Gasket" to get to the product. If I posted a link, it would probably be broken in a couple months.
UPDATE: Received the o-rings from Aliexpress in the mail. They fit perfectly and the slightly extra thickness helps to seal a little better than an OEM o-ring (5mm versus 4.5mm).
Search for this title "CS 5mm OD16-100mm Green FKM Fluorine Rubber O Ring O-Ring Oil Sealing Gasket" to get to the product. If I posted a link, it would probably be broken in a couple months.
UPDATE: Received the o-rings from Aliexpress in the mail. They fit perfectly and the slightly extra thickness helps to seal a little better than an OEM o-ring (5mm versus 4.5mm).
__________________________________________________
Robert
1987 K75 @k75retro.blogspot.ca
K100-forum.com » Technical, repair and troubleshooting » Engine and transmission » Fuel Tank Leaking
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