Emilie Meyer
Replacing a trunk pan can be a complex process, requiring a range of tools and techniques. The trunk pan is the sheet metal surface area located in the trunk of a car, which is often prone to rust and corrosion due to poor weather stripping. Before beginning the replacement process, it is essential to assess the extent of the damage and determine whether a full replacement or a patch repair is more suitable. The process typically involves removing the gas tank, cutting out the old trunk pan, preparing the surface, and installing the new pan, ensuring a precise fit and secure welds. The decision to patch or replace depends on various factors, including cost, labour, and the condition of the trunk pan.
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What You'll Learn
Removing the gas tank
Firstly, ensure you have the necessary tools and equipment for the task. There are various fasteners, clamps, and connections that must be removed or loosened when removing a fuel tank. These include strap bolts, which typically require a 1⁄2 or 9⁄16 inch (1.3 or 1.4 cm) or 12, 13, or 14 mm open-end wrench. You will also need slotted and Phillips screwdrivers for hose clamps and special tools for disconnecting fuel line fittings. Other useful items include a jack, jack stands, a pump for removing the fuel, fuel-rated containers for the removed fuel, rags, and a fire extinguisher.
Next, it is important to remove the ground cable of your battery to prevent any sparks. Before removing the gas tank, you must completely drain it. Gas can be emptied to reduce the weight, and it is a good idea to have a container ready to catch the draining fuel. Most fuel tanks have a 12 to 20-gallon capacity, so you can estimate the amount of fuel in your tank if your fuel gauge is working. Remember to be careful and avoid spilling fuel on yourself.
Now, you can begin to disconnect the various components connected to the gas tank. Disconnect the fuel tank wiring harness connector from the auto body's harness connector. If your vehicle has a ground wire screw, remove it from the chassis. Remove the fuel lines from the gas tank, and consult your vehicle's service manual for specific directions, as sometimes a specialized tool is needed for certain types of fittings. Disconnect the filler and vent pipes by wiping them with a soft towel before detaching their tubes from the tank. Note that the tank may need to be lowered slightly to access these connections, so be cautious to avoid any damage.
Finally, unhook the filler neck. Depending on the type, either remove the screws around the filler neck if it is a one-piece assembly, or loosen the clamp and remove the neoprene hose if it is a two or three-piece assembly. With these steps completed, you should have successfully removed the gas tank, allowing you to proceed with the next stages of the trunk pan replacement.
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Using the right tools
Once the gas tank is removed, you can begin working on the trunk pan itself. You will need a drill to drill out the spot welds that hold the pan in place. A 5/16" drill bit is commonly used for this purpose. You may also need to remove factory spot welds, which can be done using a drill with a 5/16" "bullet tip" design. For spot weld removal and new spot welds, a grinder, such as the Bosch 4" grinder, can be very useful. In tight spaces, such as body supports and tank supports, a 90-degree die grinder can be more effective than air shears.
When cutting out the old trunk pan, a jig saw, thin 4-inch cut-off wheel, or body saw can be used to make clean cuts. You can use the old pieces as templates to cut the new pieces slightly bigger (by 1/4" or less). Mark the locations of the tank support spot welds and mock up the new pieces to scribe a line for trimming any excess material. A MIG welder is essential for welding in new metal pieces.
It is important to note that you should avoid lap welding any part of the trunk pan, as it can compromise the integrity of the welds. Instead, butt weld the new pieces in place, especially when working with the drop-off area of the panel. This will also reduce the amount of grinding required in the trunk.
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Prepping the floor
The next step is to address the existing rust and corrosion on the trunk floor. This may involve cutting out the rusty areas with tools such as air shears, a plasma cutter, or a drill. It is important to drill out the factory spot welds and separate the spot welds on the front and rear of the rockers. The chosen cutting tool can be used to remove most of the metal quickly, and a grinder can be used to smooth out the spot welds. It is recommended to place towels over the trunk edge to provide a comfortable work surface, as this process may require spending a significant amount of time leaning over the edge.
Before installing the new trunk pan, it is crucial to take measurements and outline the new pan on the existing metal. This ensures a precise fit and helps determine the placement of components such as the gas tank supports. It is advised to take pictures and measurements of the gas tank supports and their straps to ensure proper alignment during installation. Additionally, it is important to retain the old metal pieces until the job is complete, as they may be needed for reference or temporary usage.
When installing the new trunk pan, it is essential to consider the type of pan being used. Two-piece pans are often easier to install and adjust, while one-piece pans offer a more seamless fit and require less finish work. However, one-piece pans may require additional effort during installation and can be more challenging to work with due to their size. It is recommended to use butt welds and dress them properly to make the welds virtually undetectable. Additionally, it is important to plug weld the new holes in the pan to the gas tank supports and ensure a tight fit.
Finally, to prevent future corrosion, a light coat of phosphoric acid can be applied to the new trunk pan. This step ensures the longevity of the repair and helps maintain the appearance of the trunk. It is also beneficial to use a small body filler squeegee to apply a smooth coat, making the trunk pan installation as inconspicuous as possible.
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Cutting out the old trunk floor
To begin cutting out the old trunk floor, you must first remove the gas tank. This will require you to completely drain the tank. The two straps holding the tank to the gas tank braces are welded to the bottom of the trunk floor. The rear screws are 3/8" hex head and the front bolts are 9/16" hex head. Spray the bolt threads with PB Blaster to aid with removal.
Next, you can use a sharpie marker to outline the new trunk pan on the existing metal. You can then use a drill to drill out the factory spot welds. A 5/16" "bullet tip" design is recommended. You can use a grinder for spot weld removal and new spot welds. A 90-degree die grinder works great in tight places such as the body and tank supports.
Now, you can use a jig saw, thin 4-inch cut-off wheel, or body saw to cut the old trunk floor pieces out cleanly. You can use the pieces as a template to cut the new pieces slightly bigger (1/4 or less). Mark where the tank support spot welds were drilled out, mock them into place, and scribe a line exactly where to trim the excess off the patches until you have a great fit.
Finally, you can use the new pieces as patches and butt weld them in from the bottom, which will reduce the amount of grinding you have to do in the trunk.
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Installing the new trunk pan
Installing a new trunk pan is a complex process that requires careful preparation and a range of tools. Here is a step-by-step guide to installing a new trunk pan:
Step 1: Prepare the Vehicle
Before beginning the installation, ensure you have thoroughly prepared the vehicle. This includes removing the gas tank by draining it and disconnecting the sending unit and ground wire. You should also remove any carpeting or interior trim that may interfere with the installation. Additionally, it is recommended to take measurements and pictures of the existing trunk pan and gas tank supports for reference during the installation.
Step 2: Cut and Remove the Old Trunk Pan
Use a jig saw, thin cutoff wheel, or body saw to cut and remove the old trunk pan. Cut along the marked lines, ensuring a clean and precise cut. Remove the old welds and separate the panels. It is important to try and preserve as much of the original metal as possible. You can use the old pieces as templates for the new patches.
Step 3: Prepare the New Trunk Pan
Lay the new trunk pan in place and outline it with a marker. Mark the locations of the gas tank supports and spot welds. Drill out the welds with a drill bit of the appropriate size, such as 5/16". Ensure you do not drill through the supports. Grind the spot welds flush using a grinder, such as a 4" grinder.
Step 4: Install the New Trunk Pan
Position the new trunk pan into place, ensuring a tight fit. Secure the pan by welding it into place. You can use butt welds or plug welds, depending on the specific application. Ensure that you follow the manufacturer's instructions and take the necessary safety precautions during the welding process.
Step 5: Finish and Seal the Trunk Pan
Once the welding is complete, grind the welds smooth and apply a light coat of phosphoric acid to prevent corrosion. Use a body filler squeegee to apply a smooth coat of seam sealer, ensuring that the trunk pan installation blends seamlessly with the surrounding area.
Step 6: Reassemble and Test
Finally, reassemble any removed components and perform a thorough inspection and testing of the vehicle. Ensure that all connections are secure and that the trunk pan is properly sealed. Test drive the vehicle to ensure that the repair was successful and there are no issues.
It is important to note that this process may vary depending on the specific vehicle and the extent of the repairs needed. Always refer to the vehicle's repair manual and seek professional assistance if you are unsure about any steps.
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Frequently asked questions
Basic tools include air shears, a plasma cutter, a drill, a grinder, and a body filler squeegee.
First, remove the gas tank by draining it and removing the straps holding it to the gas tank braces. Next, cut out the old trunk floor pieces and use them as a template to cut the new pieces. Drill out the spot welds and grind them smooth before installing the new pan. Finally, apply a coat of phosphoric acid to prevent corrosion and seal the seams.
This depends on the extent of the damage and your budget. Full one-piece pans require less finish work and save time compared to patching, but they can be more expensive and overwhelming to install. Patching may be more cost-effective and less labour-intensive if done properly.
