Here are the four probable causes of the Fuel Level Sensor Circuit Malfunction code, in no particular order.
1: Open/short circuit
2: Cluster
3: Tank unit
4: Open case GND
When you dropped/raised your tank, did the wires get tugged? I agree with above, that it may well be the sender unit but I would test/check others first, since it doesn't cost anything.
1: Open/short circuit
2: Cluster
3: Tank unit
4: Open case GND
When you dropped/raised your tank, did the wires get tugged? I agree with above, that it may well be the sender unit but I would test/check others first, since it doesn't cost anything.