Thanks for the advice guys, i really appreciate it. It drove me on a straight line and now i know what i have to do,but i'm really freaked out about working with the fuel tank (had a scary experience few yers ago, but thanks God i don't have any scratch

)
I've made some researches and got some interesting information witch might help someone:
On the E36 325i coupe, the fuel senders (they are 2) are under the backseat.
The left fuel sender is a stand alone one,might have a fuel compensating siphon pump (models built up to 1995) and the right fuel sender is mounted on the fuel pump. The models built from 1995 have the fuel compensating siphon pump separately from the left fuel sender.After removing the cover, I'll have to disconnect the white plug on each sender unit, and before dismounting them from the fuel tank, first operation is to measure the resistance value. The values must be aproximately the same for the both units, and they are as follows:
Right Side Empty - 10-12 ohm
Left side Empty - 10-12 ohm
Right Side Full - 250-255 ohm
Left side Full - 250-255 ohm
The uel compensating siphon pump maintains the fuel level between the left and the right tank lobes.
You have here attached some sketches with the fuel tank and the fuel senders.
This weekend I'll start to dig and i will come back with news.
