My 04 Honda Civic fuel door will not open. Can

read the oper. guide yet?
check all fuses.
do inside car , locks work, all of them?

child safety on doors activated check doors around latch.Thanks

First off obtain the shop manual for your model. It will give you steps and photos on how to fix almost anything on your vehicle.
A good shop manual will save you thousands in parts and time.

You can get to the latch through the trunk. In the trunk, pull theliner away from the area adjacent to the fuel door. You'll see a blackcable that goes to the fuel door latch behind a metal frame. Reach inand turn the latch mount 90 degrees to release it from the fuel doorframe. Your fuel door will now be open.

For a fix, look at this low cost solution: http://www.instructables.com/id/Fix-Broken-Fuel-Door-Cable-on-Honda-Civic-82170/

I tried it over the weekend. It works great.

if it is a central lock mechanism then it should lock all doors. check the motor/solenoid of each door. also the electrical connections.

This video will show you how to remove the door panel on a 01-05 Honda Civic. hope this helps you out.

pull the release cable and prop it up with something, while it is prop'd up go tap on the fuel door, if that doesn't work then you may have to pry the fuel door open

pull cover in trunk back find cable near fuel door..break if you have to ..cables are required to repair correctly

The release cable is sticking or broken. To release the fuel door, open the trunk and pull off the fabric liner on the left side of the trunk. Behind this liner is the fuel door release cable; this cable leads to the fuel door and attaches with a twist-lock connector. It is cylindrical with two tabs. Twist the connector clockwise about 90 degrees and it should pull out, releasing the door.

Just remember, the fuel door will not stay closed until you put the connector back in.

you have a bad lock actuator the locking & unlocking is built into the actuator