Regan Brown
Dropping the fuel tank of a Chevy Silverado is a complex task that requires careful preparation and a range of tools. Before starting, it is advisable to run the tank almost empty and siphon out the remaining fuel. The next steps involve disconnecting the wiring harnesses and gas line quick connects, as well as removing the bed of the truck to access the tank. This process can be challenging due to potential issues with corrosion and seized bolts, especially in regions with high levels of salt and rust. It is recommended to clean the area and replace any rusted bolts to prevent further complications. Once the tank is accessible, the filler neck, hose clamps, and electrical connections must be detached, and the tank can then be lowered and removed.
Characteristics and Values Table for Dropping the Fuel Tank of a Chevy Silverado
| Characteristics | Values |
|---|---|
| Difficulty Level | Easy for experienced mechanics, difficult for beginners |
| Tools Required | Flat ATV jack with straps, 7mm socket, 10mm socket, 13mm socket, 15mm socket, flat-head screwdriver, jack stands, motorcycle jack |
| Preparation | Run the tank to almost empty, disconnect fuel pump wires/lines, remove filler neck, remove plastic shield |
| Post-Removal | Clean the area of any foreign debris, replace the fuel pump, reverse steps to reinstall |
| Alternative Methods | Taking the bed off instead of dropping the tank, using a lift pump to unhook the fuel line and pump out fuel |
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What You'll Learn
Removing gas from the tank
Firstly, it is important to note that there are various methods to remove gas from the tank, and the most suitable method may depend on your specific vehicle and the tools available. One common method is to use a siphon pump to remove the gas. Siphon pumps can be manual or electric, and they are designed to safely transfer gasoline.
If you are using a siphon pump, start by disconnecting the fuel line from the engine. Place one end of the fuel line into a bucket or suitable container, and ensure the other end remains connected to the fuel pump. You can then jump power to the fuel pump, allowing it to drain the gas from the tank.
Alternatively, if you do not want to use a siphon pump, there are other methods to consider. One option is to locate a bolt head that is not attached to a bracket and drain the tank through the hole. This method may be applicable to modern Ford vehicles and some Jeep models.
Another approach is to depressurize the fuel injector rail by popping the hood. You can then remove the tire valve, attach a small rubber hose to the fuel line near the injectors, and cycle the pump by turning the vehicle on. This method involves turning the key off and on to keep the fuel pumping, as fuel-injected engines typically stop the pump after 30 seconds if no pressure is detected.
It is worth noting that some vehicles, such as industrial trucks with side fuel tanks, may have fuel lines that are easily accessible and can be removed with a simple wrench. Additionally, if you have a lift pump, you can unhook the fuel line and use the lift pump to remove the gas.
Before attempting any of these methods, it is recommended to consult a professional or seek advice from a trusted source. It is also crucial to prioritize safety and take the necessary precautions when working with gasoline.
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Disconnecting the fuel pump
Firstly, it is essential to run your fuel tank as close to empty as possible before beginning the disconnection process. This step will make the job much safer and more manageable. Once the tank is near-empty, gather the required tools, including various socket sizes (7mm, 10mm, 13mm, and 15mm), a flat-head screwdriver, a jack, and jack stands.
Next, start by loosening the straps that hold the tank in place. Depending on your model, you may need to remove a bracket or foam strips fused to the frame. If your Silverado has a plastic shield over the gas tank, as some models do, you will need to remove it first by unscrewing the bolts holding it in place.
After the straps are loose, pull the tank down or back slightly until you can access the hose clamps and filler neck. Ensure the filler neck is loose, then detach the filler from the tank. Be cautious, as the filler neck can sometimes hold the entire weight of the tank. Once the filler is detached, you can start disconnecting the fuel pump wires and lines. Squeeze the connectors and pull them off, being mindful of their orientation to avoid confusion when reassembling.
Finally, lower the tank a little more to reach the electrical connections on top of the fuel pump. Depending on the age and model of your Silverado, you may encounter the old or new type of connector. For the old type, cut the connector and connect the new pump's connector tubes, using the provided shrink wrap. For newer models, you may find that the connector has already been replaced, making this step unnecessary.
By following these steps, you can successfully disconnect the fuel pump, allowing you to proceed with dropping the fuel tank or performing other maintenance tasks on your Chevy Silverado or GMC Sierra. Remember to place the appropriate jacks and stands to ensure your safety and that of your vehicle during this process.
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Dealing with corrosion and rust
First off, it is important to assess the severity of the rust and corrosion. If the rust is extensive and has caused significant damage to the fuel tank, it may be necessary to replace the entire tank. This can be quite expensive, especially for certain types of vehicles. However, if the rust is more localized or minor, repairing the tank may be a viable option.
Before attempting any repairs or maintenance on your Silverado's fuel tank, it is crucial to take safety precautions. Make sure you are working in a well-ventilated area and have the necessary personal protective equipment, such as gloves and eye protection. Drain the fuel tank completely, and if there is any standing water, remove it using a suitable method, such as a sump pump or by tilting the tank.
Next, you will need to clean the interior of the tank to remove any rust, corrosion, or debris. There are specialized products available for this purpose, such as KBS Klean, which can be diluted with hot water and agitated with metal objects to effectively clean the tank. For more severe corrosion, a product like RustBlast can be used to dissolve rust and corrosion and prepare the surface for the next step.
After the tank is thoroughly cleaned and dried, it is time to apply a fuel tank sealer to inhibit future rust and corrosion and to seal any small holes or weld seams. Gold Standard Tank Sealer is a highly regarded product that can be poured into the tank and left for 45-60 minutes, with the tank being frequently rolled to ensure all interior surfaces are coated. It is important to drain the tank completely after this process and allow the sealant to cure for several days before refilling the tank with fuel.
Additionally, there are preventive measures you can take to minimize the chances of future corrosion and rust issues. Regular maintenance and inspections of your fuel tank are crucial. Keep the tank as full as possible to avoid moisture buildup, and consider using a corrosion-resistant finish, such as Hammerite Direct to Rust Metal Paint, which repels water and prevents rust. A bund, or secondary containment structure, made of concrete or brick, is also recommended to contain any potential spills or leaks.
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Using a jack to lower the tank
To lower the fuel tank of a Chevy Silverado safely, it is recommended to use a jack to support the tank while removing the fuel lines. Here is a step-by-step guide on using a jack to lower the fuel tank:
Preparation:
Before starting, ensure your safety by chocking the wheels to prevent accidental movement. It is also advised to run your tank to almost empty, making the process more manageable. Additionally, if your gas tank has a plastic shield, remove it first. You will need a 13mm socket to remove the four bolts holding the shield.
Jack Positioning:
Place a jack under the truck's rear and use jack stands for added stability. A motorcycle jack is particularly useful for raising and lowering the tank. Ensure the jack is secure and can support the weight of the tank.
Lowering the Tank:
Use a flat ATV jack with straps to lower the tank. First, loosen the tank straps, and if present, remove the bracket. You will need a 15mm socket to remove the tank straps. Once the straps are loose, the tank should be ready to lower.
Detaching Connections:
Before fully lowering the tank, ensure you can reach and detach the electrical connections on top of the fuel pump. Squeeze the connectors and pull them off, and consider colour-coding them with tape to remember their correct positions.
Final Lowering:
Finish lowering the tank slowly and carefully. Place 2x4s or similar supports underneath to slide the tank out smoothly.
Reversing the Process:
Once you have completed your maintenance or repairs, simply reverse the steps to reinstall the fuel tank. Ensure all connections are secure before removing the jack and lowering the vehicle.
Remember always to follow safety protocols and refer to manufacturer guidelines or professional advice if you are unsure about any steps.
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Disconnecting electrical connections
Disconnecting the electrical connections is a crucial step when dropping the fuel tank of a Chevy Silverado or GMC Sierra. Here is a detailed guide on how to safely and effectively complete this task:
Before beginning, it is highly recommended to run your fuel tank as close to empty as possible. This will make the process of dropping the tank much easier and safer. Additionally, ensure you have the necessary tools, such as a jack and jack stands, to securely support the vehicle and access the fuel tank.
Start by locating the electrical connections on top of the fuel pump. These connections will need to be carefully disconnected before lowering the tank further. Squeeze the connectors and gently pull them off. To avoid confusion when reassembling, consider colour-coding the connections and the pieces they are disconnected from with tape. This will ensure that you reconnect them correctly without mixing up the orientation.
At this point, you can finish lowering the tank. Before completely lowering it, it is advisable to place some 2x4s or similar supports on the ground so that you can slide the tank out smoothly. This will prevent any unnecessary strain or damage to the tank or its connections.
If you encounter rusted or seized bolts, it is suggested to replace them with new ones from a hardware store. Additionally, cleaning the area of any foreign debris before removing the lock ring is essential to prevent any issues with the seal.
Finally, be cautious when dealing with fuel lines and harnesses. If they are seized or broken, you may need to cut them and consider soldering and heat-shrinking new ones. Always refer to manufacturer guidelines or seek professional advice if you are unsure about any steps or encounter unexpected complications.
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Frequently asked questions
It is recommended to take the bed off your Silverado instead of dropping the tank. However, if you still want to drop the tank, you will need to get it loose from the body first. Pull the tank down/back a little until you can reach the hose clamps and detach the filler from the tank itself. Then it will come down. Make sure you disconnect the fuel pump wires/lines first.
You will need a 7mm socket for the 3 bolts that hold the filler neck, a 10mm socket for the grounding strap attached to the filler neck and frame, a 13mm socket to remove the 4 bolts that hold the tank shield, a 15mm socket to remove the 2 tank straps, a flat-head screwdriver, a jack, and jack stands.
Before starting, run your tank to almost empty. As an extra precaution, you can remove the fuel pump relay in the fuse box. Then, jack up the rear of the truck and place a jack stand under it. This will give you extra wiggle room underneath the truck.
Some common issues include corrosion and rust, especially if you live in the salt belt or rust belt. You might also encounter seized bolts or plastic breaking. Additionally, you might need to cut fuel lines and harnesses due to seizing or plastic breaking.
