BMW K bikes (Bricks)

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1Back to top Go down   fuel sender Empty fuel sender on Mon Aug 21, 2017 5:22 pm

Flash of the gap

Flash of the gap
active member
active member
hi guys, my red fuel light comes on full when i fill the tank, as it goes down it goes off , back to front so to speak, 
i took off fuel cap and lifted the float, light comes on , when i push the float down, to bottom it goes off  Sad any ideas, thanks in advance



Last edited by Flash of the gap on Tue Aug 22, 2017 3:58 am; edited 1 time in total

    

2Back to top Go down   fuel sender Empty Re: fuel sender on Mon Aug 21, 2017 5:26 pm

92KK 84WW Olaf

92KK 84WW Olaf
Life time member
Life time member
It's an incorrect setting of the Sally Gap.

Not sure is it possible something is electrically reversed? I take it that you only have the single fuel warning light?


__________________________________________________
1992 K100LT 0193214 Bertha Alaska Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 58,645 now 100,380 miles
1983 K100RS 0011171 Fricka 29,495 miles Damn K Pox Its a Bat outta Hell No 33,600 miles
    

3Back to top Go down   fuel sender Empty Re: fuel sender on Mon Aug 21, 2017 5:40 pm

Flash of the gap

Flash of the gap
active member
active member
@92KK 84WW Olaf wrote:It's an incorrect setting of the Sally Gap.

Not sure is it possible something is electrically reversed? I take it that you only have the single fuel warning light?
yes olaf, the 7l doesnt seem to light amber

    

4Back to top Go down   fuel sender Empty Re: fuel sender on Mon Aug 21, 2017 7:06 pm

robmack

robmack
Life time member
Life time member
It would be nice to have the model year and type of K-bike you own in your signature line.  This helps immeasurably when seeking help.

You have an 84 K100RS I take it based on posts you've made previously.  So, that means you have the older thermistor based fuel sender.  This unit has a pair of resistors inside the tank that change value depending on temperature and a circuit card inside the instrument cluster that interprets their values.  Either the sender or the circuit card is broken. My guess is the sender unit based on neither light working properly, but that's only a guess.  You could disconnect the sender from the harness and test the  thermistors for proper operation to narrow down the failing components. You should also figure out if the 7L indicator bulb is missing, blown or broken while you're at it.


__________________________________________________
Robert
1987 K75 @k75retro.blogspot.ca
http://k75retro.blogspot.ca/
    

5Back to top Go down   fuel sender Empty Re: fuel sender on Tue Aug 22, 2017 2:53 am

92KK 84WW Olaf

92KK 84WW Olaf
Life time member
Life time member
Very important to show model, year and VIN number.

My own K is 84 K100RT and as said you will have the earlier 4/7l warning lights. Later Ks have a single 5l warning light and the units differ. Your fuel rank should be bolted down?

As far as I know the 'sender' units in the earlier tank don't actually move, they work on the basis of the fuel cooling the unit rather than using a float that moves, no fuel means it gets warmer and creates the electrical connection.


__________________________________________________
1992 K100LT 0193214 Bertha Alaska Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 58,645 now 100,380 miles
1983 K100RS 0011171 Fricka 29,495 miles Damn K Pox Its a Bat outta Hell No 33,600 miles
    

6Back to top Go down   fuel sender Empty Re: fuel sender on Tue Aug 22, 2017 3:39 am

Flash of the gap

Flash of the gap
active member
active member
@robmack wrote:It would be nice to have the model year and type of K-bike you own in your signature line.  This helps immeasurably when seeking help.

You have an 84 K100RS I take it based on posts you've made previously.  So, that means you have the older thermistor based fuel sender.  This unit has a pair of resistors inside the tank that change value depending on temperature and a circuit card inside the instrument cluster that interprets their values.  Either the sender or the circuit card is broken.  My guess is the sender unit based on neither light working properly, but that's only a guess.  You could disconnect the sender from the harness and test the  thermistors for proper operation to narrow down the failing components.  You should also figure out if the 7L indicator bulb is missing, blown or broken while you're at it.
thanks robmack, i,ll work on in during the week, and see how it goes, need to run out the fuel in the tank,

    

7Back to top Go down   fuel sender Empty Re: fuel sender on Tue Aug 22, 2017 3:43 am

Flash of the gap

Flash of the gap
active member
active member
@92KK 84WW Olaf wrote:Very important to show model, year and VIN number.

My own K is 84 K100RT and as said you will have the earlier 4/7l warning lights. Later Ks have a single 5l warning light and the units differ. Your fuel rank should be bolted down?

As far as I know the 'sender' units in the earlier tank don't actually move, they work on the basis of the fuel cooling the unit rather than using a float that moves, no fuel means it gets warmer and creates the electrical connection.
this has a float in the tank olaf, if i could find how to post a picture i would

    

8Back to top Go down   fuel sender Empty Re: fuel sender on Tue Aug 22, 2017 4:01 am

Flash of the gap

Flash of the gap
active member
active member
@92KK 84WW Olaf wrote:It's an incorrect setting of the Sally Gap.

Not sure is it possible something is electrically reversed? I take it that you only have the single fuel warning light?
your most likely right olaf, i did have the fuel sender out, when cleaning out the tank, i probably put the wires,  back wrong, reversed like


__________________________________________________
bmw k100rs, 0010723 / 31000 mls
    

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