Fuel Gauge not working

[raleigh29]

Well my gas gauge is stuck at full on the 325ic. Every now and then it goes down to half full then goes back to full.

Any common failure modes on these?

[scforeigncar]

Same thing is messed up in my is. It does a little dance from time to time too.

[jlevie]

My first suspicion would a problem with the fuel level sensors or a short in the wiring from the cluster to the sensors.

[firstRWD]

Same thing as mine. I haven't gotten into it yet since I'm still working on the engine swap. I'll post up if you haven't found an answer before I get around to it.

[raleigh29]

Same thing as mine. I haven't gotten into it yet since I'm still working on the engine swap. I'll post up if you haven't found an answer before I get around to it.

Sounds good. Keep us updated

[boston bimmer]

check the ground nut on the back of the cluster if it is loose it can make the fuel gauge "dance"

[george graves]

^yep. Works most of the time.

[Jean]

Keep in mind late cars have two sensors.

[bignate948]

where on the back of the cluster is this ground?

[jlevie]

The grounds for the cluster are via the connectors. That ground ultimately terminates at a bolt on the inside firewall just to the left the steering column a few inches below the top of the dash.

A bad ground for the cluster will affect all of the cluster instruments. If only the fuel gauge is affected the problem will be in the sensor(s), wiring to same, or the connection between the fuel gauge and the main PCB in the cluster.

[Jean]

One on each side of the gas tank, one on it's own and one inside the fuel pump.

[Jean]

I had not idea you have a 318, sorry. Late model 325i cars have 2.