BMW K bikes (Bricks)

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1Back to top Go down   Fuel pump. Empty Fuel pump. on Sat Nov 23, 2013 2:52 pm

geordie boy

geordie boy
active member
active member
Hi,
   I am undergoing repairs on my 1986 K100RS.  It is new to me and I am not familiar with its operation.

  I've read in the workshop manual, that fuel pressure from the pump to the injectors, is lowered via a regulating valve.  But I can't find out if the pump should cut off once the fuel has reached line running pressure.

 My concern, is that when I turn the ignition on, the fuel pump just keeps operating contiually.  I would have thought that the pump would be controlled to cut off, once it has reached the operating pressure.  Is this normal or do I have a problem?

best regards

geordie boy


__________________________________________________
1986 K100RS
    

2Back to top Go down   Fuel pump. Empty Re: Fuel pump. on Sat Nov 23, 2013 6:10 pm

keefk1100lt

keefk1100lt
Silver member
Silver member
If the pump were to cut off, you'd lose pressure in the line to the injector rail and the motor would stop. So yes, the pump runs continuously Very Happy

    

3Back to top Go down   Fuel pump. Empty Re: Fuel pump. on Sat Nov 23, 2013 9:54 pm

RicK G

RicK G
VIP
VIP
The pump should not run until you press the start button and for 1.5 seconds after you release the button if the engine is not running.  The pump should run all the time while the engine is running because the pressure has to be kept constant.


__________________________________________________
"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 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

4Back to top Go down   Fuel pump. Empty Re: Fuel pump. on Sun Nov 24, 2013 6:37 am

geordie boy

geordie boy
active member
active member
@RicK G wrote:The pump should not run until you press the start button and for 1.5 seconds after you release the button if the engine is not running.  The pump should run all the time while the engine is running because the pressure has to be kept constant.
Thanks RicK G,
                   so the fuel pump is only energised when the start button is pressed!  Thought it was strange for it to run continuous with only the ignition switched on.  Looks like I've got a bit of diagnostic work to do to cure the problem. 
 If you, or any members, have come across this problem before, I would appriciate any advice.

best regards

geordie boy


__________________________________________________
1986 K100RS
    

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