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greenrider

Fuel gauge not reading correctly

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greenrider

My fuel gauge isn't reading properly any more. It seems to show approx 4 bars less then what it should be. When I turn the key on at first it shows correctly but then drops in a approx 10 seconds.

When it shows empty the low light doesn't come on which it shouldn't at that point. I still have 100 km to go before it should come on but the gauge is showing empty.

 

Any ideas?

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RPG
My fuel gauge isn't reading properly any more. It seems to show approx 4 bars less then what it should be. When I turn the key on at first it shows correctly but then drops in a approx 10 seconds.

When it shows empty the low light doesn't come on which it shouldn't at that point. I still have 100 km to go before it should come on but the gauge is showing empty.

 

Any ideas?

 

FWIW, I tried all the known fixes including the new ground wires solution outlined in the link and still can only get 8 bars. Its one of those things I've resigned to defeat as the time spent ripping the bike apart each time just isn't worth it to me. Also, I'm the only one seeing the problem so I just don't let it bother me.

 

But I wish you the best of luck.

 

RPG

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Selden

Did you clean the contacts of the multi-contact connector under the right side of the tank? I use a piece of plastic tubing of appropriate diameter with a small strip of 400 wet or dry inside and DeOxIt, then clean the male connector pins with a paper towel. For the female pins, same basic technique, but a small diameter wooden dowel, no sandpaper.

 

I finished my annual maintenance about 6 weeks ago, and after cleaning the contacts, the distance from full tank to 1 bar down increased from about 35 miles to 40 miles.

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greenrider

Thanks for the info.

It used to work properly then this winter did major service, removed fuel tank to replace fuel filter.

The first tank I didn't see a problem then the second tank I thought my fuel mileage did a major dive,till I caught on it was the gauge.

So I will check the plug some time when it get an incredible urge to remove the Tupperware, hopefully it's not inside the tank

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AnotherLee

Like many of you, I got tired of my fuel gauge reading low so I recently tried Roger_04_rt's advice and connected the small ground wire from the fuel tank directly to the battery. My results:

 Bars        Gal to fill        Gals left (6.7–Gtf)
  1             5.5                      1.2
  1             5.6                      1.1
  2             5.0                      1.7 

:dance:

This data selected from 12 fill-ups over about 450 miles.

The gauge now goes to 10 bars at every fill-up.

Thank you, Roger!

Edited by TheOtherLee

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AnotherLee
This data selected from 12 fill-ups over about 450 miles
Correction: make that about 1800 miles.

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PAS

"Additionally, vehicle's fuel sending units equipped with silver plated resistor card/contacts are especially vulnerable to attacks by elemental sulfur and/or hydrogen sulfide found in fuels. Adding BMW Group Fuel System Cleaner Plus immediately upon noticing erratic fuel gauge behavior may, in many cases, restore proper performance due to the additive's ability to remove the harmful sulfur compounds from the sending unit's contact surface. Additionally, BMW Group Fuel System Cleaner Plus can help protect the fuel gauge from future malfunctioning by coating all metal surfaces of the fuel system." Techron/Chevron makes the BMW Cleaner.

 

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philbytx

After 15 years with Darth, I've learned to ignore the RID. I simply fill the bike up after every ride and know I'm good/safe for 240 miles the next ride!

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rhaubold

I also have this problem with my 04 1150RS. I've cleaned the contacts and it does seem to help. I have seen products that claim to help improve electrical contacts. Not just cleaners but contact enhancers. Anyone have any experience with such products?

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Sam Taylor

When this happened to me, at about 90K, I did all the proper contact cleaning at both the tank connector and at the RID connector behind the front fairing. Helped a bit but not enough.

 

So I took off the tank and flipped it in my hands and shook it a bit, then flipped it and shook some more. I could hear the float inside running up and down the tube. Did it a few times more.

 

The problem was fixed.

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