1. Diagnose the Problem:
* Stuck/Won't Open: This is often due to a faulty cable, a jammed latch mechanism, or corrosion. Check the cable for kinks or breakage. Try lubricating the latch mechanism with WD-40 or a similar lubricant (penetrating oil). If it's severely jammed, you might need to carefully access the latch mechanism from the inside of the trunk (depending on the design, this may require some interior panel removal).
* Broken Latch: If the latch itself is broken, you'll likely need a replacement. This often requires removal of the inner trunk panel and may involve some mechanical skill.
* Bent/Damaged Door: This requires a different approach depending on the severity of the damage. Minor dents might be repairable with a dent puller or body filler, while significant damage may require replacement of the fuel door assembly.
* Loose/Wobbly Door: This usually indicates worn or broken hinges. You may be able to tighten existing screws or bolts, or you might need to replace the hinges. Again, this may require access from the inside of the trunk.
* Cosmetic Damage (Scratches, Paint Chips): This is the easiest to fix. Cleaning, polishing, touch-up paint, and possibly clear coat will take care of minor cosmetic issues.
2. Repair Steps (General):
* Gather Tools: You'll likely need screwdrivers (Phillips and flathead), possibly sockets, pliers, WD-40 or other lubricant, a hammer (if addressing dents), body filler (if needed), sandpaper, primer, paint, and clear coat (for cosmetic repairs). Consult a repair manual for specifics.
* Access the Fuel Door Mechanism: This usually involves removing interior trunk panels. A repair manual is essential here, as the process varies depending on the year and model.
* Inspect the Mechanism: Once you have access, carefully examine the cable, latch, and hinges for damage.
* Repair or Replace: Repair the damage as described above. If the damage is severe, replacement is often the easiest option. You can find used parts online (eBay, car-part.com) or from junkyards. New parts might be harder to find for an older vehicle.
* Reassemble: Carefully put everything back together, ensuring all the components are correctly aligned and securely fastened.
3. Important Considerations:
* Repair Manual: A Haynes or Chilton repair manual for your specific year and model Pontiac GTP is invaluable. It will provide detailed diagrams and instructions for accessing and repairing the fuel door mechanism.
* Safety: Disconnect the battery's negative terminal before working with any electrical components.
* Professional Help: If you're not comfortable working on your car, or if the damage is extensive, consider taking it to a qualified mechanic.
Finding Parts:
Finding replacement fuel doors for a 2000 Pontiac GTP might be challenging. Check online auto parts retailers, junkyards, and online classifieds.
In short, fixing a fuel door issue requires a careful diagnosis and then the appropriate repair or replacement based on the discovered problem. A repair manual is strongly recommended to avoid further damage.
