E39, 540. Inaccurate fuel gauge.

[tima 5]

Hi,

My e39 540 fuel gauge has stopped working correctly. Started to only report half of what was in there and now i removed the battery to see if it would work and doesn't report any at all.

Any suggestions?

Cheers

[yng_750 247]

Go into the obc hidden functions and view fuel level.

Google how to access it.

Should show readout from each of the two senders. See if one reads zero.

If its reading half it makes sense that one sender has failed.

[tima 5]

Edited October 27, 2014 by tima

[yng_750 247]

yup bad sender.

guessing its the right hand one.

heres a guide to removing.

http://www.pelicanparts.com/BMW/techarticles/BMW-5-Series-E39/82-FUEL-Fuel_Pump_Sender_Removal/82-FUEL-Fuel_Pump_Sender_Removal.htm

pulling the plugs out should reveal if the sender has an break or if the wiring is buggered.

not sure if they are fixable or just need replacement

[tima 5]

yup bad sender.

guessing its the right hand one.

heres a guide to removing.

http://www.pelicanparts.com/BMW/techarticles/BMW-5-Series-E39/82-FUEL-Fuel_Pump_Sender_Removal/82-FUEL-Fuel_Pump_Sender_Removal.htm

pulling the plugs out should reveal if the sender has an break or if the wiring is buggered.

not sure if they are fixable or just need replacement

Ill pull it out and give it a good shake about and see what happens. Strange it decides now its time and then both die..

[tima 5]

Update.

I pulled the battery out and now it says its 100% empty but still reads 31l on the left like it said on the OBC.

[yng_750 247]

The dash readout are sometimes delayed from.actual readings to stop fast changes.

When i changed my outside thermometer it took two days to go from negative 60 up to actual temp. Though hidden functions showed it straight away.