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  Topic: K1100LT fuel pump wont start (again)
Offf

Replies: 11
Views: 14962

PostForum: Tech   Posted: Fri May 31, 2013 6:14 am   Subject: K1100LT fuel pump wont start (again)
My Motronic is very similar to this one (socket on side)
http://www.bmwallparts.com/ECU-Bosch-Motronic-0261200402-e30-325i-525i-P2658831.aspx

cannt take picutre of actual unit, right now. Dint saw ...
  Topic: K1100LT fuel pump wont start (again)
Offf

Replies: 11
Views: 14962

PostForum: Tech   Posted: Fri May 31, 2013 2:44 am   Subject: K1100LT fuel pump wont start (again)
I don't have my K here to check but is the earth wire from the Motronic to the frame in good nick and screwed to the frame?

Is there any separare earth wire? I dont see any of those. Only one very ...
  Topic: K1100LT fuel pump wont start (again)
Offf

Replies: 11
Views: 14962

PostForum: Tech   Posted: Fri May 31, 2013 2:34 am   Subject: K1100LT fuel pump wont start (again)
Cite from Motornic diagram:
"The relay ground is provided and controlled by the motronic."

So, the pump is OK, wiring is ok, relay is OK.
Pump is driven by providing ground to relay. ...
  Topic: K1100LT fuel pump wont start (again)
Offf

Replies: 11
Views: 14962

PostForum: Tech   Posted: Thu May 30, 2013 11:31 am   Subject: K1100LT fuel pump wont start (again)
Well... I'm getting somewhere

There is no ground on relays connector 85. It should be. When I wire ground directly to 85 relay acts and starts pump.
But it will not turn it off.

How long the ...
  Topic: K1100LT fuel pump wont start (again)
Offf

Replies: 11
Views: 14962

PostForum: Tech   Posted: Thu May 30, 2013 10:10 am   Subject: K1100LT fuel pump wont start (again)
1. yes fuel gague reacts
2. no, temp gauge is not moving, i think it's because engine is cold

A.
  Topic: K1100LT fuel pump wont start (again)
Offf

Replies: 11
Views: 14962

PostForum: Tech   Posted: Thu May 30, 2013 6:39 am   Subject: K1100LT fuel pump wont start (again)
I have 92 K1100LT. Recently fuel pump won't turn on when I switch ignition. (Yes, I have read another topics about this and cannot find my case).

Thus far:

Fuel pump itself working (tested wit ...
 
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