K1100rs 1994, fuel gauge reading erratic when on the move

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paul kent
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K1100rs 1994, fuel gauge reading erratic when on the move

Postby paul kent » Tue May 26, 2020 8:05 pm

Hi, does anyone know the answer to this : :-k
The fuel gauge reads the correct fuel level when stationary, but once you are on the move it moves up and down the scale as the fuel sploshes about in the tank, meaning the signal from the sender unit is not dampened to give a meaningful reading.
Now ive had this problem once before on a VW Passat and it was the fuel and Temp gauge Ballast resistor which had failed, simply replaced that for a few quids, and problem fixed.
My question is does this bike have such a Ballast resistor in the wiring, or are all these model of bmw's with the fuel gauge having the same problem, as i find it really annoying, and a bit of a distraction while riding.
many thanks if you can help.
Does anyone else with one of these early bikes have the same problem? if so id love to know your thoughts about it. :-"
Paul Kent.
Last edited by paul kent on Tue Jun 15, 2021 11:28 am, edited 1 time in total.

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SteveD
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Re: K1100rs 1994, fuel gauge reading erratic when on the move

Postby SteveD » Fri May 29, 2020 9:57 am

Where is it earthed? Simple and cheap checks first. I'd check the earth, clean, lube, reinstall, assess.
Cheers, Steve.
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paul kent
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Re: K1100rs 1994, fuel gauge reading erratic when on the move

Postby paul kent » Fri Dec 18, 2020 1:51 pm

Hi Steve,
I dont think its an earthingproblem as the gauge works fine, the fault is is the signal from the sender unit is directly going to the gauge without being controlled, which is ok when the fuel therein is not sloshing about, but once on the move and the fuel moving from front to back for instance under braking, one min we have a full tank, and then when you power away its reading empty until you change gear and the fuel moves to the front of the tank, if you get what im saying.
so to my mind it needs a signal damper to smooth out the signal to the gauge, ie: a Ballast resistor, i was wondering if there is one fitted and its failed, or maybe thats how they were made, in the early days of bikes having a fuel gauge?

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Jaythro
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Re: K1100rs 1994, fuel gauge reading erratic when on the move

Postby Jaythro » Fri Dec 18, 2020 4:56 pm

There is supposed to be a damper relay fitted perhaps its been swapped out for the wrong version
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paul kent
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Re: K1100rs 1994, fuel gauge reading erratic when on the move

Postby paul kent » Wed Jun 02, 2021 7:37 am

does anyone know where abouts this damper relay is located on the bike ? as i find this feature very annoying.
thanks for your help if anyone knows.

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windmill john
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Re: K1100rs 1994, fuel gauge reading erratic when on the move

Postby windmill john » Wed Jun 02, 2021 11:05 am

Found this on another forum:

Hi all--
found the damper relay in the #2 position in fusebox--when key is turned on, light is on--pull the relay and light goes out--went one step farther and connected the sender unit to bike (not the fuel pump!)--no change to light when arm was up or down--I checked as much of the wiring as I could without taking it all apart--no change--I think the next is to see if I can borrow GSAddict's relay before I purchase another--Is there any way to test this relay?


John
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