Whassat?

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jings
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Joined: Wed Apr 26, 2017 10:45 pm

Whassat?

Postby jings » Sat Feb 24, 2018 1:05 pm

Hi guys, Just been messing around trying to get the fuel cap bolted back in and I heard somethind drop into the bowels of the tank. After a bit of fishing (and a lot of swearing) I retrieved it, but my question is what the hell is it? I can see how it goes back together but my curiosity has been piqued!
Inkedfuel+pump+tank+assy1329151400_LI.jpg
Inkedfuel+pump+tank+assy1329151400_LI.jpg (528.45 KiB) Viewed 11029 times

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milleplod
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Re: Whassat?

Postby milleplod » Sat Feb 24, 2018 2:29 pm

Intriguing! :) What's it made of, and what does it fit to....on which bike....1200S? I'd have said its the fuel strainer that sits on the fuel pickup pipe, but it looks the wrong shape. :? Where's the diagram from - I looked at the parts fiche but can't see anything that looks like it! :?

Pete
Nocto Diuque Venamur

kfrogzx7
Posts: 254
Joined: Tue Jul 15, 2014 9:25 pm
Location: Suffolk

Re: Whassat?

Postby kfrogzx7 » Sat Feb 24, 2018 4:14 pm

I think you'll find it's the anti-emissions expansion bottle, it basically takes up the change in tank pressure during temp fluctuations and prevents fumes / fuel "blowing off" to the atmosphere.
At least that's what I always thought it was ??
Simon.
K100rs, R1100s, R1150rs, R1200st, K1300s

kfrogzx7
Posts: 254
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Location: Suffolk

Re: Whassat?

Postby kfrogzx7 » Sun Feb 25, 2018 9:18 am

Or does it prevent overfilling ? I'm not sure now
Simon.
K100rs, R1100s, R1150rs, R1200st, K1300s

jings
Posts: 5
Joined: Wed Apr 26, 2017 10:45 pm

Re: Whassat?

Postby jings » Sun Feb 25, 2018 11:09 am

fuel+pump+tank+assy1329151400.jpg
fuel+pump+tank+assy1329151400.jpg (87.69 KiB) Viewed 10918 times
Thank you for the responses guys, the expansion idea is interesting, but as its made from a hard plastic that seems unlikely. Its from a uk model '99 R1100s. It's made of black plastic with a tiny hole in the middle of it on the other side of where the metal tube enters. It's intriguing!

kfrogzx7
Posts: 254
Joined: Tue Jul 15, 2014 9:25 pm
Location: Suffolk

Re: Whassat?

Postby kfrogzx7 » Sun Feb 25, 2018 12:49 pm

So I reckon it's designed to trigger your fuel filler gun as the level reaches the neck of the tank, then still allow the fuel level to drop slightly as the fuel flows into it thru' the small hole.
Thus your tank isn't ever overfilled ?
Simon.
K100rs, R1100s, R1150rs, R1200st, K1300s

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milleplod
Posts: 866
Joined: Mon Mar 25, 2013 6:46 am

Re: Whassat?

Postby milleplod » Sun Feb 25, 2018 3:51 pm

Its a 'reduction insert', apparently! Perhaps it 'opens' extra venting as the tank fills? :?

Insert.jpg
Insert.jpg (129.41 KiB) Viewed 10906 times


Pete
Nocto Diuque Venamur

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sjrainsford
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Location: Lichfield

Re: Whassat?

Postby sjrainsford » Sun Feb 25, 2018 9:36 pm

Looks to me like it is basically a baffle for the expansion vent. Prevents sloshing around fuel from exiting the tank via the vent pipe.
2001 BMW R1100S (Merecat)
2008 Vespa GTS300 (Bianca)

Justcruising
Posts: 76
Joined: Sun Dec 27, 2015 3:33 am
Location: Brisbane, Australia

Re: Whassat?

Postby Justcruising » Mon Feb 26, 2018 10:16 am

I suspect it’s a float to keep the vent above the fuel level ... bit like a snorkel, otherwise the fuel could drain/siphon out.
2006 R1200S (Magma-Red/titan-silver) - Michelin PR4s, Akrapovic slip-on silencer, Ohlin suspension, Ilmberger Carbon hugger & Carbon valve-covers, Corbin seat.

2010 R1200R
2004 R1200C Montauk

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Britisherspy
Posts: 499
Joined: Sat Apr 03, 2010 7:19 pm
Location: Lichfield

Re: Whassat?

Postby Britisherspy » Tue Feb 27, 2018 10:17 am

If you want to replace it I think I still have a complete assembly somewhere

bfisher
Posts: 224
Joined: Mon Jan 12, 2015 10:37 pm
Location: SW London

Re: Whassat?

Postby bfisher » Wed Feb 28, 2018 12:13 am

Spot the difference between the schematic (mistake) & the picture; hint: o-ring. AND don't do what i did to correct it, lets just say it doesn't flex back to size so i discovered on weekend after accessing under tank (ecu) a 3rd time in as many months.

B

jings
Posts: 5
Joined: Wed Apr 26, 2017 10:45 pm

Re: Whassat?

Postby jings » Wed Feb 28, 2018 3:52 pm

Thanks Britisherspy, but I've got it all back together again and so far it seems to be ok (after purchasing a new O-ring as I found out the same thing that bfisher did)! I was just wondering what its actual purpose was as I have no idea!


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