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Could be a problem with the gauge in the instrument cluster, or the wiring that goes back to the tank, or the sending unit in the tank. The sending unit has a float much like your toilet which could stick or fail to move.
Digital gauge also gets its input for fuel level from a float in the tank. Here the culprit can be that float because the error is systematic i.e., full on empty and empty on full/half. If the reading was erratic then it was something to do with IC in the bars display panel.
Hi,
Check both the gas float and the fuel gauge.
The terminal wire on the fuel float when grounded on the bare metal body of your car it will register on your gauge as "FULL ", if not the fuel gauge is malfunctioning and have to replace.
When it register to your gauge as "FULL", the problem would be the gas float inside the fuel tank.
A technician could replace it for you.
Hope that helps you out.
Thanks for asking FixYa!
pull the cluster out and check for soft set coupler check all couplers on the fuse panel one sounds to be soft set or you have a bad ground best to take to a dealer but i work for honda builing civics and it is very comon to find a soft set coupler when we do our checks on line so maybe one has slipped through but it is one of those 2 things i am 99% sure
remove float assembly and reposition it facing the oposite direction. Sometimes the float installation positioning makes a difference on how the fuel gage reads.
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