1994 honda civic dx 260k miles-Gas Gauge not working

Does the gauge work? You see it is up or full in day light? If the light went out, It is just 1 LED. You have to replace the Instrument panel to fix it. Several hundred dollars and it has to be programmed to your car. More cost. I would live with it.

Erratic Idle On Civic - YouTube

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My 1994 Honda Civic SI has an erratic idle. It stays at 3000-3500rpm when started cold till it warms up then ...

High idle and constant up and down idle on my 94 civic ex? ' Yahoo ...

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Oct 27, 2011 - Okay so im learning lots about Honda's, i have rebuilt motors and put them but i cant ... It has a constant up and down idle between 1200 and 2000 rpms. ...to a near stall for a fraction of a second, then jumps back up, like clockwork. ... No coil packs on your 1994, of course - just one coil and a distributor. Rpm jumping up and down at warm up 1k to 2k 97 honda prelude ...
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The fuel meter inside the tank has malfunctioned. One option is to replace the fuel pump. Second option is to bring down the fuel tank and remove the fuel pump and check see if the metering rod was bent. Now if you are not having problems with the fuel pump. I would deal with the gauge being low and continue running the car until the time comes to replace the fuel pump.

Check your fuse , check the wires to the gas tank , could be the mechanism inside the tank , if you cant get it working use your trip meter as a gas gauge so you don't run out , just reset it when you fill your tank and refill before a set # of miles , lets say 200 miles , just fill the tank and reset the trip meter , just remember to fill the tank full and reset to 000 every time so you wont run out of gas

The sending unit in gas tank is broken - hence the wrong readings of how much gas is in the tank. Replace unit.

There is a sending unit in the gas tank that measures fuel level, it mostly likely needs to be replaced.

Most cars and truck nowdays show the tank empty when you start it. Then it slowly advances to the correct level of fuel in the tank. You can try and use some fuel additives like Gumout or Valvoline that clean the injectors and other fuel sytem parts. You can get a buildup of tarnish in these parts and this can cause slow readings. If this was the case it should improve after a few tank fulls of gas with the cleaners added. The guage could also slowly be going bad. The newer style guages are connected to the fuel pump and you will need to replace the whole unit if this goes out on you. Keep in mid that when the fuel pump quits, it quits, usually without much advance notice. If the car starts sputtering and does not have full power, this will hint at the fuel pump going bad. If your car has over 100,000 miles on it, you might want to think about preparing to change the fuel pump, these seem to want to go out shortly after 100,000 miles, but you can get lucky once in a while and it can last longer. Keeping your tank at least half full with clean gas is a big help, the gas keeps the fuel pump cool so it last longer!

sending unit is going bad...

change fuel filter sound like its stopping up .

The most likely culprit is the sending unit in the tank. They are relatively easy to change, as long as you don't have much fuel in the tank. It's a mechanical unit that has a float that raises and lowers with the fuel level, however with age, the floats can develop leaks and no longer float, of the electronic portion of the unit can go bad and not register the proper level. They are replaced and an entire unit, so it doesn't matter which happened, you will need to change the fuel tank sending unit.