The cars computer is calibrated for a certain gauge wire. There is a small amount of leeway allowed. However use as close to original gauge wire as possible.
Unplugged connector, failed injector, broken wire, bad computer.
Not likely, it is a fault with injector number 3, if it were a fuse it would be the whole injection system. You most likely have a disconnected wire connector, a bad wire, or a bad injector.
Your sending unit in the fuel tank may be bad, the wire connector could be disconnectged or there is a broken wire in the circuit, or the gauge itself has an issue.
by disconnecting the coil or plug wire and the fuel injector connector also for that cylinder.
there is no fuse located for fuel gauge. check connector. maybe it is lose or some wire is discontented. check connector and cable in the back seats.
find the wire and use a wire connector that is the same gauge as the wire.krimp the ends and you should restore power to your alarm.
Since you had to unplug the wire connector, there is most likely damage to the connector. Check it carefully.
Loose connector, wire grounding out, bad sensor.
use a stronger wire for longer antennas...the gauge may not be as important as the strength if you string it outside.
Check the large connector under the seat. It is located towards the rear. The thick orange wire is possibly fried inside connector. The plastic connector used in this application is not rated for this wire gauge. It is possible to bypass connector (cheap) or replace all related wiring in the vehicle (expensive).
The size of the wire is stated by its gauge under American Wire Gauge. Six gauge wire is size 6 AWG.
Wire gauges are defined in such a way that the lower the gauge, the thicker the wire. So, 8 gauge wire is thicker than 10 gauge wire.