BMW K bikes (Bricks)

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1Back to top Go down   Fuel lights randomly working Empty Fuel lights randomly working on Fri Aug 07, 2015 7:16 pm

TheJoker

TheJoker
Silver member
Silver member
Hi as of title really, the first few weeks I was riding the k100 it was fine however as of recently the fuel lights seem to only come on at random intervals. Now I'm not sure where to start with this problem, I thought it was an earthing problem after the starter motor incident however that hasn't sorted it out. So far I'm just using the trip and fill up every 100 so miles (taking £15); doesn't bother me doing this but I would rather sort the niggle out. Which shouldn't be that low MPG really should it Question

I was also thinking it could be the bulbs however as I've recently checked it happened in london when I was doing a courier job that the 4 litres light came on and was working. Then both the 7 and 4 litres lights came on. Managed an extra 30 miles out of it and still had about 5 litres left in the tank at the end of it.

Just wondering with all your intelligence any idea what it could be, possibly fuel sensor Question

Oh here is a photo from one of my last rides it's not the best but I quite like it, I'm getting the panel painted and have a tinted screen on order. From another thread couldn't afford the comfort seat on my last trip so unfortunately never got it. Going to be looking out for another and a red top box if anyone has one knocking around.

Fuel lights randomly working OFWN3iN


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My Bike List past to present so far;

Lexmoto (first bike ever to ride) , CB125 TDC 86 , CG125 89 , GN125 97 , ER5 96 , K100 RS 84

84/01 K100rs 0013627
    

2Back to top Go down   Fuel lights randomly working Empty Re: Fuel lights randomly working on Fri Aug 07, 2015 8:39 pm

RicK G

RicK G
admin
admin
More than likely it will be the sensor itself. Two thermistors are used one for 4lt and one for 7lt. they proved to be unreliable in 1983 so were abandoned in favor of the more conventional float set up of the later type.  I don't know of anyone who has successfully repaired them but I would replace the tank with the later model even though there is a fair bit of work doing it or just continue on as you are


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"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
    

3Back to top Go down   Fuel lights randomly working Empty Re: Fuel lights randomly working on Sat Aug 08, 2015 2:37 pm

duck

duck
Life time member
Life time member
It MIGHT be a connector issue. Pull the left lower fairing and try jostling that a bit to see if that helps.

If it does turn out to be a connector issue then there's a "free" replacement on the bike already.  The unused white 4 lead alarm connector in the relay box is the same.

As Rick noted, putting on a newer tank is feasible but requires some modding/fabrication since the rear mounts to the frame differently. And then there's painting unless you find an identical/acceptable color.

Simplest solution: Reset the trip odo every time you fill up and keep an eye one the miles/kms to know when to fill up again.


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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 (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

4Back to top Go down   Fuel lights randomly working Empty Re: Fuel lights randomly working on Sat Aug 08, 2015 7:55 pm

Stan

Stan
Life time member
Life time member
Unfortunately, been there done that......reset your trip meter as suggested or get yourself another trip meter/speedo by buying a push bike trip computer...fairly cheap and you have another trip meter to use. ( Sigma brand). The only way of fixing the problem is to buy another sender unit..which will end up the same way as your current one.


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1983 K100 basic vin 0003960 colour red  GONE
1987 K100RT vin 0094685 colour, orange peel, sorry, pearl..GONE
F800R black
    

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