My 2005 Mazda MPV fuel door release latch is broken, what is the name of the part so that I can order one? Also, I think I need to replace the release cable for the fuel door release latch, is that hard to do? Thank you for your help

I would repair it.

The fuel door release latch for a Holden Barina 2 door hatch auto 2005 is typically located on the driver's side of the vehicle, near the bottom of the dashboard.
To access the fuel door release latch, you will need to look for a lever or button that is labeled with a fuel pump icon or the word "Fuel". Once you locate the latch, simply pull or press it to release the fuel door and access the fuel filler cap.
If you are having trouble locating the fuel door release latch, you can refer to the owner's manual for your vehicle or consult a mechanic or dealership for assistance.

The latch might be stuck. Take a small screw driver and carefully insert from side of fuel door (avoid scratching and denting) and get some one to pull the release lever inside the car. Pull out the door carefully. If this is not working then the release cable is broken or has come off from the lever. Will need to be restored before you can do anything. Otherwise you will damage the door latch.

I did answer this still open the door cover and pull on the steel rod connector to the lock to release

You need to see if the latch bar ( curved metal piece that holds onto the strike bolt ) is in the closed position - if so, you'll need a helper to open it. You should also check to see if it is lubricated, which can keep it from latching.
When you look into the latch assembly, you should see a clear pathway for the striker bolt to enter the assembly. If there is a bar ( or hook ) blocking it, then you can use a flat blade screwdriver to move it to the open position. Insert the screwdriver into the latch assembly where you can pry on the inside of the hook, using the body of the door for leverage. position your screwdriver and then have your helper pull ( or push ) the outside door button / handle as you apply a small amount of pressure to the inside of the hook - the hook should easily slide out of the way. If it is hard to move, you'll need to spray some lubrication into the latch assembly. You can buy a can of white lithium grease in a spray can that will do the job.
There is a certain angle you'll need to pry in to get the latch to open - you may need to place the blade of the screwdriver through the hook and on the outside edge of the door or outside edge of the latch assembly, then gently push the screwdriver handle towards the outside of the van as the handle/ button is used.
Hope this helps!!

U CANTI UNLESS U USE A FLATHEAD SCREW DRIVER TO POP LATCH OTHERWISE REPLACE CABLE TO LATCH

The only place you are going to find those parts is at the dealer or a salvage yard. The dealer may even be able to get just the clip, but sometimes (especially with Mazda) you will have to buy the complete door latch assembly.

It is probably due to bent rods that attach to the handle and run to the latching mechanism inside the door panel. If you remove the door panel with the window up you should be able to reach in and straighten the rods.This was a recurring problem on mine.

Does anyone know the cylinder number locations??