Fuel level reading not correct, what's up?

[91 318is]

Pulled the seat and the cover. Pulled it off and nothing's under there. So apparently I only have one sender.

What's next?

[91 318is]

#9 is the thin sender inside the pump, there is also another sender on the other side of the tank..it's about 2x as thick. It's not pictured. Just pull the seat and look for a round cover.

fair enough. I'll be back.

[Jean]

#9 is the thin sender inside the pump, there is also another sender on the other side of the tank..it's about 2x as thick. It's not pictured. Just pull the seat and look for a round cover.

[91 318is]

One is on the passenger side in the fuel pump assembly, and one is on the driver's side. Look again.

is the sender seperate from the pump assembly?

9 is the only listing they have for a sender?

[Jean]

One is on the passenger side in the fuel pump assembly, and one is on the driver's side. Look again.

[91 318is]

Just looked on realoem and they're listing ONE fuel sender in the tank?

[91 318is]

Yes I have a 91 318is.

So there is 2 senders in my tank? I only saw one when I took the cover off under the rear seat (I think I did).

Well to be honest, I'm not sure if it's a early model cluster or not. All I know is after the cluster was swapped, the fuel indication hasn't been right since. I installed a new, correct part number fuel gauge yesterday and that didn't fix it, made sure the code plug on the front of the cluster is correct, and it is.

Thanks

[Kershaw]

i had this issue. i swapped a late model cluster into my early model car, because the car came with an eta cluster and i put an i engine in it.

all i did to fix it was swap the old fuel gauge into the new cluster.

[e30Matt]

Yep, dead on the money. You can swap a fuel gauge by itself into an early cluster and be OK, though. The difference is entirely in the gauge.

[Jean]

So you have a late model car yes? It has TWO senders, they work together as they are connected in series. Have you checked them both? If one is OFF, reading will be OFF.

The fuel gauge in your cluster needs to be from a late model car as well. Basically it needs to be from a car that had TWO senders.

[91 318is]

Posted this in the electronics section, might get more luck here so I copied and pasted.

Long story short, cluster was swapped out and now the fuel gauge is reading 1/2 tank when fuel tank is almost empty, and the low level light comes on. I read around and seemed like a normal problem with swapping early model clusters into late model cars. I got a working gauge and matched the part #'s with realoem's correct part # for my car, swapped it, and is still not correct. I also swapped the fuel level sender, that obviously didn't help.

Oh and I also, I checked to make sure the little box that plugs in the front of the cluster is the correct one and it's the blue one, which is for the 318.

Anyone have any idea?