BMW K75 Low Fuel Light

Motorcycle Mechanics - Motorcycle Technical Discussion. 

Bookmark this page:  YahooMyWeb Yahoo!  Google Google  Windows Live Favorites Windows Live  del.icio.us del.icio.us  digg digg  Add to Netscape Netscape
Subject Author Date
BMW K75 Low Fuel Light kwhiner 02-22-2007
If you were  Registered and logged in, you could reply and use other advanced thread options
Posted by kwhiner on February 22, 2007, 3:47 pm
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


Posted by Mark Olson on February 22, 2007, 3:56 pm
kwhiner wrote:
> 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.

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.

--
'01 SV650S '99 EX250-F13 '98 ZG1000-A13
OMF #7

Posted by Timo Geusch on February 24, 2007, 3:08 am
Mark Olson wrote:

> kwhiner wrote:
>> 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.
>
> 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.

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.

--
Morini Corsaro 125 | CB450K4 | XL250 Motosport x2 | 900SSD | VFR750
Triumph T-Bird chop | K1100LT BOTAFOF #33 TWA#10
The UKRM FAQ: http://www.ukrm.net/faq/index.html
"Je profite du paysage" - Joe Bar

Posted by Captain Midnight on February 23, 2007, 2:00 am
> 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
>

If you have a gauge, bending the float will change the level of it too.
Looks like on my ST1100 the float grounds the bulb so as the fuel level goes
down more current goes through the circuit. Dirty/corroded connections would
reduce the current making it "come on" at a lower level. If your system is
like mine making sure all the electrical connections are clean and tight
would be the first step.

Good idea to check all your connections at home. No ignition or lights would
be bad in the desert too.

I have the gauge and light but still constantly monitor the trip odo. Picked
up the habit when my bikes only had 3.5gallon tanks and only a reserve.



Posted by Rob Kleinschmidt on February 23, 2007, 1:38 pm
>
>
> > 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
>
> If you have a gauge, bending the float will change the level of it too.
> Looks like on my ST1100 the float grounds the bulb so as the fuel level goes
> down more current goes through the circuit. Dirty/corroded connections would
> reduce the current making it "come on" at a lower level. If your system is
> like mine making sure all the electrical connections are clean and tight
> would be the first step.

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 ?




Similar ThreadsPosted
signal light problem.... April 23, 2007, 9:47 pm
Battery Warning Light ON... June 18, 2008, 8:41 pm
Re: '89 Venture Royal Warning Light April 12, 2006, 5:14 pm
1981 kaw 1000 CSR rear running light July 21, 2008, 9:45 pm
gxsr 1000 dash and head light issues September 7, 2008, 10:22 pm
Re: ethanol and other fuel May 27, 2007, 5:48 am
Re: Fuel Filter installation May 7, 2007, 3:42 am
Re: Fuel Filter installation May 7, 2007, 9:11 am
Magna v30 stalls when fuel low May 14, 2007, 12:59 am
1982 Goldwing Fuel pump April 12, 2008, 11:19 am

Contact Us | Privacy Policy

XML SitemapXML Sitemap