I have a 520d had issue where would run out on 1/4 tank or around 87mls left I changed pump and sender and it’s still the same looked on secrecy menu says L 15.1 R00.0 S15 also throwing these codes on Carly 00931A 009319 any help would be great 

Hi Richard 

Have the codes been cleared after changing the fuel pump and sender ? If not that is where I would start also try disconnecting the Battery (Neg First) for around 30 mins. If the codes wont clear normally a sign that either sender is at fault or there is a wiring issue check the earths.

Dave

I cleared them with Carly I’m assuming the left side is reading empty as tanks not full but will try battery at the weekend 

Morning Richard

When you say you cleared them did they stay cleared? Or are they back ? have you checked the left level sensor ? Have you checked www.realoem.com to see if you have 2 level sensors?

Dave

I have one on either side replaced both scanned for codes and they have cleared only codes I’ve got now are pdc and glow plug module which I know about just got to see if it will go lower than a 1/4 of a tank or brim it on pay day unsure how else to test if it’s working as there are no codes now while engine running 

I guess it is carry a Spare Gallon and let it drop below a 1/4 tank if the Gauge keeps reading below a 1.4 it should indicate the senders are working.

Assuming from your first post before gauge stopped reading at 1/4 and stayed there.

Dave