Find the problem? No separate fuse for the gas gauge, if the rest of dash and gauges work (the temperature gauge), not a fuse problem.
Take off the electrical connector at the gas tank, find the wire for the fuel sender unit in the tank to the gas gauge, and ground it temporarily to the car body, with the key ON. If the gas gauge needle jumps when grounding the wire, the gauge is good, and the problem is with the sender unit in the tank.
SOURCE: Citroen c1 petrol gauge not moving
http://citroenc3owners.com/diesel-citroen-c3/fuel-gauge-fault-t398.html
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