1. Check the Obvious:
* Cable: The most common issue is a problem with the cable that connects the release lever inside the car to the fuel door latch. Try gently pulling on the cable near the fuel door itself (you might need a flashlight and might have to access it from the trunk or wheel well, depending on the car's design). If the cable feels broken or disconnected, you'll need to replace it.
* Lever: Ensure the lever inside the car is working correctly. Sometimes, the lever can get jammed or broken internally. Try operating it firmly but carefully. If you suspect a broken lever mechanism, you'll likely need to access and repair or replace it from inside the vehicle.
* Latch Mechanism: The latch on the fuel door itself might be jammed with debris, frozen (if it's cold), or simply worn out. Try gently working the door back and forth while someone else operates the release lever.
* Electrical (Less Likely, but Possible): Some later model cars used an electric motor for the fuel door release. If yours does, check the fuse related to the fuel door release (consult your owner's manual).
2. Gaining Access (If Necessary):
If the cable is broken or the latch is stuck, you'll probably need to get the fuel door open manually. This usually requires some level of disassembly:
* Inside the Trunk/Wheel Well: Look for access points to the fuel door mechanism from either the trunk or the wheel well. You may need to remove panels or trim pieces to get a better view. Use caution not to damage anything.
* From the Outside (Last Resort): If all else fails, you might need to carefully pry the fuel door open using a thin, flat tool like a plastic pry tool. Be very careful not to scratch or damage the paint or surrounding trim. This is a last resort because it can cause damage.
3. Repair or Replacement:
Once you've determined the cause, you'll need to address it:
* Cable Replacement: This will require replacing the entire cable. You'll need to find a replacement cable at an auto parts store (possibly specifying that it's for a 1994 Cadillac).
* Latch Replacement: If the latch mechanism is faulty, this might be a more involved repair that requires replacing the entire latch assembly.
* Lever Repair/Replacement: Similar to the latch, the inner lever mechanism could be repaired or replaced, depending on the extent of the damage.
4. Professional Help:
If you're not comfortable with automotive repairs, it's best to take your car to a qualified mechanic. They have the tools and experience to diagnose and fix the problem safely and efficiently.
Important Safety Note: Always exercise caution when working around fuel systems. If you smell fuel, stop immediately and have the problem addressed by a professional. Never work on the fuel system near an open flame.
