BMW K75 Low Fuel Light

Have a minor problem with the low fuel light coming on late. Supposed
to come on at 25% left in the tank mine is coming on at about 10%. Was
looking to bend the rod in the tank just a tad, but not sure which way
to go with it so that the light will trigger sooner. Not really a
problem around town, but out in the NV desert could be a bummer.

Any thoughts suggestions welcome.

Thanks.

kwhiner

 

Bend the rod upward a little so the potentiometer is reading the
same resistance when the fuel level is higher.

I'd rather have a low fuel light that came on at 10% than 25% but
that's just me, I guess.

Does the bike have a fuel gauge or just a light? Most of my bikes
didn't have a light or a gauge, just a trip meter and a reserve tap
and by keeping track of my typical mileage and how many miles were
on the tripmeter, I managed well enough.

 

That seems odd.

For any normal guage, you'd expect >> less << current as the
guage read lower. A pot in the tank grounding the circuit could
be either increasing or decreasing its resistance as level
dropped. Seems like increasing resistance and
decreasing current would be more intuitive.

What does the guage read if you disconnect it ?
High or low ?

 

Most K75s just have the light although the RT often has a fuel gauge as
well.

To the OP - there's an article on IBMWR that explains a yearly contact
cleaning exercise which may well bring the fuel light up to its previous
light-up point. I'd try that before playing with the fuel gauge sender.