BMW K bikes (Bricks)

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1Back to top Go down   K1100 Fuel Pump Empty K1100 Fuel Pump Thu Sep 27, 2012 10:36 am

gmcq

gmcq
Gold member
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During our trip up the Antrim Coast last Saturday, ComberJohn said something along the lines of "Hey boy, your fuel pump sure is noisy" to which I replied "apparently they are all like that". Dont think ComberJohn bought that. So, having been made paranoid, I took a sound level reading with the tank empty and got 34db. Then I took out the pump, checked rubbers & filter and all seemed ok. Looking in the tank, I noticed a length of rubber laying at the bottom, see pic 1. It turned out to be a cushion of sorts between the fuel pump bracket and tank wall. Put back in place, see pic 2 and thought that might quiten things down. New sound recording got the same 34db! Do I just accept its noisy and watch small children run for cover or is there something amiss?

K1100 Fuel Pump Img_1110

Black rubber thing

K1100 Fuel Pump Img_1112

Now back in place on right hand side


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1996 K1100LTIC 0235790
    

2Back to top Go down   K1100 Fuel Pump Empty Re: K1100 Fuel Pump Thu Sep 27, 2012 1:05 pm

Inge K.

Inge K.
VIP
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They all behave like that, sir.

Especially when the fuel level is low
and the top of the fuel pump is exposed above the surface.

Added to that also the tank act as a resonance chamber.
As the fuel level drops, the sound level increases.


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

3Back to top Go down   K1100 Fuel Pump Empty Re: K1100 Fuel Pump Sat Sep 29, 2012 5:56 pm

K-BIKE

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Interesting thread, I found exactly the same bit of rubber laid on the bottom of the tank as well years ago I asked the list if anyone had an idea but no solid leads, I even asked the mechanic at the BMW bike shop I buy my bits from, both looked knowledgeably at it and said never seen one before. Your suggestion looks like it might be the solution does everyone concur?
Regards,
K-BIKE

    

4Back to top Go down   K1100 Fuel Pump Empty Re: K1100 Fuel Pump Sat Sep 29, 2012 6:51 pm

Inge K.

Inge K.
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In the different forums it`s been a lot of owners who have found this pieces in the bottom of the tank.
And a lot of headscratching.....since it don`t exist a part number.

This won`t be the last one....................


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

5Back to top Go down   K1100 Fuel Pump Empty Re: K1100 Fuel Pump Sat Sep 29, 2012 8:40 pm

RicK G

RicK G
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The previous owner of my now sold K100 apparently found it in the tank and put it on the float arm. When I saw it there I thought it was in its correct place and was for ages telling people that was where it went. Felt like a real fool when the truth emerged. Laughing


__________________________________________________
"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
    

6Back to top Go down   K1100 Fuel Pump Empty Re: K1100 Fuel Pump Sat Sep 29, 2012 8:47 pm

Inge K.

Inge K.
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Not the first one, it was also a couple owners in another forum that came to the conclusion that the float arm must be correct place..............some years back.


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

7Back to top Go down   K1100 Fuel Pump Empty Re: K1100 Fuel Pump Sun Sep 30, 2012 4:02 am

gmcq

gmcq
Gold member
Gold member
I only noticed because the one on the left hand side of the bracket was still in place otherwise god only knows where I would have put it (probably in a drawer!)


__________________________________________________
1996 K1100LTIC 0235790
    

8Back to top Go down   K1100 Fuel Pump Empty Re: K1100 Fuel Pump Sun Sep 30, 2012 5:58 am

charlie99

charlie99
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draw would be a better solution than floating round in the tank ....poor old rubber bits


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cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%OK1100 Fuel Pump Au-log10

'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
    

9Back to top Go down   K1100 Fuel Pump Empty noisy fuel pump Fri Jan 18, 2013 4:12 am

redbaron

redbaron
active member
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Due to the type of technology involved, i.e. its a roller cell pump it becomes noisy after a while. Ive found from experience that its time to replace the pump rather than be stranded in the boondocks. This pump is not unlike the injector pumps used in automobile applications in fact many of the pumps from German cars will work OK in your bike as long as the pressure rating and size are the same. There are even aftermarket pumps that will work just fine and at much reduced cost. Ive just replaced the injector pump in my Audi A6 for that very reason. Its a Bosch pump but its made in Poland, go figure.

    

10Back to top Go down   K1100 Fuel Pump Empty Re: K1100 Fuel Pump Sat Feb 16, 2013 5:42 am

gmcq

gmcq
Gold member
Gold member
When I turned the key last night I was not met with the usual cacophony of the fuel pump. Tested the four pin connector and voltage only measured at the white wire. All fuses checked with meter and ok. Could it be the relay and if so which one is it?

While I was at it, i pull the pump out and tested it, surprising how quite it is outside the tank! Reversed the polarity to flush it out backwards and tiny metallic flakes now visible in the filter, not a good sign me thinks.

GMcQ


__________________________________________________
1996 K1100LTIC 0235790
    

11Back to top Go down   K1100 Fuel Pump Empty Re: K1100 Fuel Pump Sat Feb 16, 2013 6:25 am

RicK G

RicK G
admin
admin
No that usually isn't a good thing to see, it often means that something is preparing for a self destruct effort.


__________________________________________________
"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
    

12Back to top Go down   K1100 Fuel Pump Empty Re: K1100 Fuel Pump Sat Feb 16, 2013 6:31 am

gmcq

gmcq
Gold member
Gold member
Was thinking that Rick, pump top of the wish list. Turned out to be the side stand switch not working. Disconnected the connection block and using a wire joined the two terminals and the pump fired up.

GMcQ


__________________________________________________
1996 K1100LTIC 0235790
    

13Back to top Go down   K1100 Fuel Pump Empty Re: K1100 Fuel Pump Wed May 01, 2013 5:10 pm

gmcq

gmcq
Gold member
Gold member
Well, replacement pump fitted. The difference in sound is unbelievable! There is no sound Very Happy The banshee is gone. Cant wait until ComberJohn hears it, or rather, cant hear it! With the squealing gone, my bike sounds great, couldn't appreciate it before.

Question: My bike seems to be running better; ticks over better and acceleration is smother. Is it possible that the old pump was delivering fuel at a low pressure or is it just the placebo effect?

GMcQ


__________________________________________________
1996 K1100LTIC 0235790
    

14Back to top Go down   K1100 Fuel Pump Empty Re: K1100 Fuel Pump Wed May 01, 2013 8:23 pm

RicK G

RicK G
admin
admin
Low fuel pressure will make them a bit ornery.


__________________________________________________
"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
    

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