BMW K bikes (Bricks)

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1Back to top Go down    What am I forgetting?!? No fuel Pump on Wed Jun 07, 2017 1:23 am

TurboBrick

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Hi everyone. The Turbo Brick is back from paint and is all one color again but upon reassembly I went to fire it up but the fuel pump is inop. I did a quick check with the test light and I'm getting no power to the + wire at the pump or at the connector. Side note the fuel gauge works fine. What am I forgetting here. This has to be something stupid. Everything worked fine a week ago.

    

2Back to top Go down    Re: What am I forgetting?!? No fuel Pump on Wed Jun 07, 2017 1:58 am

RicK G

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8 or 16 V they are different in the pump region but both get a signal from the ignition to keep it going. The K100 will run for 1.5 sec after the start button is released and always when the button is down and the 16v when the key is turned on the pump will run for 1.5 sec. Result is that when just sitting with the key on the pump doesn't have power until the start button is pressed. Connect power to the pump using the connector plug (NOT INSIDE THE TANK.....BOOM!) that will prove the pump and check all the fuses as those blade ones do go open circuit without having blown, better still just replace them and future proof them.


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"Every normal man must be tempted, at times, to spit upon his hands, hoist the black flag, and begin slitting throats." from Mencken's 1919 Prejudices

Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

3Back to top Go down    Re: What am I forgetting?!? No fuel Pump on Wed Jun 07, 2017 7:11 pm

TurboBrick

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Which wire on the plug is the one that is for the fuel pump? And my bike is a 91' 16v


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1991 K100rs w/ Luftmeister Competition Turbo Kit
    

4Back to top Go down    Re: What am I forgetting?!? No fuel Pump on Wed Jun 07, 2017 7:16 pm

duck

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@TurboBrick wrote:Which wire on the plug is the one that is for the fuel pump? And my bike is a 91' 16v
Green/white is 12V+ for fuel pump

Brown is ground

White is low fuel lamp

Yellow is fuel gauge


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Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

5Back to top Go down    Re: What am I forgetting?!? No fuel Pump on Wed Jun 07, 2017 7:36 pm

TurboBrick

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Strange enough it works fine now. I took it apart and put it back together. There is no telling. Thank you for the help though. As a reward I'll post pictures of the bikes new paint job later on! It looks awesome!

    

6Back to top Go down    Re: What am I forgetting?!? No fuel Pump on Wed Jun 07, 2017 8:46 pm

Born Again Eccentric

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@TurboBrick wrote:Strange enough it works fine now. I took it apart and put it back together. There is no telling. Thank you for the help though. As a reward I'll post pictures of the bikes new paint job later on! It looks awesome!
That all points to having had a dodgy electrical connection, either at the pump or (more likely) the 4 pin connector behind the side cover to the rear of the fuel tank. By pulling it apart and reassembling, you probably scraped a little crud/corrosion off the contacts and improved your electrical connection. A can of DeOxit is a good thing to have to hand when looking into K bike electrics.

Good result!


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Paul

"Heidi" K100LT 1991 (Grey) (VIN 0190172 Engine No. 104EB 2590 2213) - 5th owner. January 2014 (34,000 - 61,000 miles and counting....)
"Gretel" K100LT 1989 (Silver Grey) (VIN 0177324 Engine No. 104EA 2789 2211) - 4th+ owner. September 2015 (58,500miles and counting....). Cat C Insurancewrite-off rebuild Feb 17
"Donor" K100LT 1990 (Red) (VIN 0178091 Engine No. 4489 2024) - 6th & final owner (crash write-off now donor bike). June 2012 (73,000 miles) to November 2013 (89,500 miles)
    

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