Q: seats not moving /Gas on 2002 Infiniti I35

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My drivers seat wont move forward or backwards but up and done why is this? And how much does it take to fill up my gas?
(1) Answer
Either the switch has failed or the fore-and-aft motor has failed, or there is a wiring problem. More likely the switch or motor. Get down on the motor connector with a meter and see if there's power and ground when the switch is operated. If not, suspect the switch and the wiring. If so, and the motor doesn't move, suspect the motor. You can find the fuel tank capacity listed in the owner's manual.