BMW K bikes (Bricks)

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KJB

KJB
active member
active member
I have heard a noise comming from the fuel tank and at first I thought it was the fuel pump getting old (my bike has 51,000 miles) so decided to replace both the fuel pump and filter at great expense. When I fitted the nee fuel pump I was horrified to find out the noise was still there. Anyway I tracked it down to the last possible thing which was a non return valve on the return pipe (You can take it out by a 19mm spanner). I took the spring and the ball bearing out and hey-presto...no noise.

So save yourself ££££ by not paying for a fuel pump and check that first!

My question is what can I replace the non return valve with-did BMW modify this for the early models? I'm told the later tanks have a N-R-valve which is not compatible with my 1984 tank???

Thank you for any suggestions

Regards Kim Beresford

    

RicK G

RicK G
admin
admin
Yeah its a bit of a trap for the unwary that one.
The later tanks had the return line going to the top of the tank so that fuel didn't run back when the tank was removed apparently you can attach a rubber hose to the spigot inside the tank and bring it up to the top of the tank. some of the other guys that have done it will be able to give a better description on how.
Just a hint hop over to the new members thread and do an intro and then after a few more posts Crazy Frog (Bert from Admin) can give you a pass word to the downloads section.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 2004 K1200GT 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

Inge K.

Inge K.
VIP
VIP
And keep in mind that inside the tank you must use a submersible fuel hose
(SAE 30R10).


__________________________________________________
Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

sidecar paul

sidecar paul
Life time member
Life time member
Hi Kim,

Another option is to fit fuel line connectors with built-in shut-off valves.
http://k100rt.aforumfree.com/t3308-fuel-line-connectors

BTW, welcome to the forum.
Cheers,
Paul.


__________________________________________________
'84 K100RS (0014643) (owned since '85), 86 K100RS (0018891) with Martello sidecar (built as an outfit in '88),
'51 Vincent (since '67),'72 Montesa Cota (from new), '87 Honda RS125R NF4 (bought 2015) 
....No CARS never ever!
    

5Back to top Go down   Noisy fuel tank non return valve on 1984 K100RS Empty fuel line. Tue Jul 03, 2012 8:34 am

Ajays

Ajays
Life time member
Life time member
I removed the ball and spring long ago [early models] and being lazy I clamp the tube when removing the tank disconnecting at the lower point.

Another issue I had was a wrong routing of the return tubing that when the water hose got hot it almost closed the return pipe being trapped and gave off a reed high pitched note. Ran normal when cold....you can imagine my frustration until I solved it.

There are ways of using a Ford pump or similar http://www.4shared.com/account/dir/CDKNGc7N/sharing.html ?&

Cheers Ajays


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Noisy fuel tank non return valve on 1984 K100RS Th_Kengine_gif

AJAYS
    

6Back to top Go down   Noisy fuel tank non return valve on 1984 K100RS Empty Ideas! Tue Jul 03, 2012 12:12 pm

KJB

KJB
active member
active member
Thanks for the ideas-I think I'll fit an in-line valve...this is probably the easiest option. The tank has been on and off loads of times now!

How do I add a picture of my bike? I can't see how or where to do that.

Thanks Kim

    

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