Mercedes Mullins
The C3 Corvette is a vintage car with a steel fuel tank that is prone to rust and abrasion. Over time, the fuel tank can become damaged and may need to be replaced. The process of removing the fuel tank involves first dropping the spare tire, which is held under the rear of the car. Once the spare tire is removed, the gas tank can be accessed and the process of draining the fuel and removing the tank can begin. This may involve removing the supply line hose from the hard line on the right frame and draining the fuel into a suitable container. It is important to ensure that the tank is properly supported during this process due to its weight and bulkiness. The fuel tank is held in place by straps and a removable cross-member beam, which need to be undone to remove the tank.
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What You'll Learn
Remove spare tire and carrier
To empty the fuel tank of your C3 Corvette, you must first remove the spare tire and carrier. Here is a detailed guide on how to do this:
Remove the spare tire and carrier:
- Locate the spare tire: The spare tire of your Corvette is held under the rear of the car in a clamshell-style holder.
- Lift the tire: Insert the tool provided with your jack into the hole at the back of the clamshell to lift the tire slightly.
- Loosen the bolt: With the tire lifted, proceed to loosen the bolt holding the clamshell in place.
- Lower the tire: Once the bolt is loosened, lower the lever to set the tire down on the ground.
- Remove the clamshell assembly: Undo the bolts that hold the top half of the clamshell to the car's frame. By removing this assembly, you will expose the gas tank, which is located under the rear end of your vehicle.
- Remove the entire spare tire assembly: As mentioned in one source, you will need to remove the entire spare tire assembly, including the cross brace. This step is crucial to accessing the gas tank for further maintenance or replacement.
Additional considerations:
- Weight and safety: It is worth noting that the fuel tank in a C3 Corvette is located above the carburetor. This placement can be a safety concern, as a severed fuel line could siphon all the fuel out of the tank in the event of an accident. Additionally, the weight of the fuel tank is substantial, negatively affecting the handling of the vehicle.
- Spare tire alternatives: Some Corvette owners have suggested alternatives to storing the spare tire above the tank, such as utilising roadside assistance services or carrying a fix-a-flat kit and a small electric pump.
- Lowering the tank: Lowering the fuel tank's position is often considered a good idea to improve safety and handling. Some owners have suggested placing the spare tire where the fuel tank currently sits, which could help lower the centre of gravity and enhance driving dynamics.
- Tank replacement: Due to the age of C3 Corvettes, the fuel tanks and their components are prone to rust and corrosion. Regular inspection and maintenance are necessary, and tank replacement may be required to address leaks and ensure the vehicle's longevity.
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Drain fuel into a suitable container
To drain fuel into a suitable container, you can use a hose, a manual pump, an air compressor, or a siphon pump.
Using a Hose
Using a hose is the most common and straightforward method of draining a fuel tank. Place one end of a hose into the fuel tank and suck on the other end to start the flow of fuel, then quickly place the hose into a container. This method carries some risk of inhaling toxic fumes, and fuel can get into your mouth, which is dangerous.
Using a Manual Pump
Using a manual pump is a straightforward process that can be completed with just a few tools. You will need a manual pump, a fuel tank adapter, and a fuel line. Connect the fuel line to the tank adapter and the adapter to the manual pump. Start the pump and keep a container nearby to collect the fuel. When you’re done, disconnect the fuel line, turn off the pump, and store the tools.
Using an Air Compressor
Draining a fuel tank using an air compressor is straightforward, but it requires tools like an air compressor to finish the job quickly. You will need an air compressor, a fuel tank adapter, and a fuel line. Connect the fuel line to the tank adapter and the adapter to the air compressor.
Using a Siphon Pump
Attach the pump to the hose, insert one end into the fuel tank and the other into a suitable container, then operate the pump to start the fuel flow. This method minimizes direct contact with fuel.
General Considerations
Make sure to have a wide-mouthed container, such as a basin, to catch the fuel from the tank. It is important to note that you should not drain your fuel tank onto the ground. Instead, contact a professional service to properly dispose of the fuel if needed.
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Support the tank with a floor jack
To support a C3 Corvette fuel tank with a floor jack, you must first drain the tank and remove the spare tire and carrier. You can then remove the supply line hose from the hard line on the right frame. Plug the hose and support the tank with the floor jack, pieces of wood, or other supporting materials.
The gas tank is held in place by a removable cross-member beam and two straps that hook onto the removable beam. You must undo the straps that are hooked into the removable cross-member beam. The gas tank should then sit on the fixed cross-member. You can now work the tank free and lower it on the jack.
It is important to note that the fuel tank of a C3 Corvette is located above the spare tire carrier. The tank is held in place by two straps that are parallel to the tank and perpendicular to the Corvette. The straps can be moved out of the way to twist and turn the tank out of the Corvette.
Additionally, the flexible fuel lines that connect the fuel tank to the hard steel fuel lines running along the car's frame may be rotten if the car is over 20 years old. These lines may seep and weep fuel before bursting open and leaking gas. Therefore, it is crucial to inspect the fuel tank and lines thoroughly before attempting to remove or lower the tank.
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Remove the supply line hose from the hard line on the right frame
To remove the supply line hose from the hard line on the right frame of a C3 Corvette, you'll need to first drain the fuel from the tank into a suitable container. It's important to note that not all the fuel will come out. Once you've drained as much as possible, plug the hose.
Now, you can start to remove the supply line hose. You'll need to use two wrenches at the same time to do this. Secure the hose with one wrench so that it doesn't turn. Then, use the other wrench to loosen the hard line from the hose.
It's worth noting that this process can be quite challenging, especially when it comes to getting room for a wrench to remove the hose. You might need to lift the body of the car a few inches to get better access. Additionally, flexible hoses may be required to replace the hard lines, especially around the rear kick-up.
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Remove the fuel sending unit from the top of the tank
To remove the fuel sending unit from the top of the tank of a C3 Corvette, you must first drain the fuel tank. This is because removing the sending unit will leave a very large hole in the bottom of the gas tank. Run as much fuel as you can out of the tank—it is much easier to drain 4 or 5 gallons of gas than 20. You can also siphon the gas out. Remember to always work in a well-ventilated area and wear eye protection.
Next, remove the spare tire and carrier support from the car. The spare tire is held up under the rear of the car in a clamshell-style holder. You have a tool in your car, along with the jack, that you can insert into a hole in the back of the clamshell to lift the tire a little while you loosen a bolt, and then you lower the lever to set the tire down on the ground. Once the spare tire is out of the car, undo the bolts that hold the top half of the clamshell to the frame of the car and remove the entire clamshell assembly.
Now, remove the spare tire carrier. It is held in by the carrier latch support assembly and four additional bolts. Once the spare tire carrier is removed, you can see where the sending unit and gravity feed line are mounted to the bottom of the tank.
Then, carefully cut the rubber hose that goes from the sending unit to the frame fuel line in half. Put a 3/8 bolt into the frame line end and let the sending unit end drain the remaining fuel in the tank into your drain pan. When the fuel is drained out, take the Corvette sending unit locking ring removal tool, place it on the locking ring tabs, and unscrew the ring. This tool is better than using a hammer and screwdriver, which is a method some people still use.
Finally, thoroughly clean the sending unit contacts. To remove the spade connector from its retainer, slip a small screwdriver into the receiving end, release the spade retainer tab, and slide the spade connector out of the back of the retainer. When you are finished, slide the connector back into the retainer and lock it into place.
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Frequently asked questions
To empty your C3 Corvette fuel tank, first remove the spare tire and carrier. Then, remove the supply line hose from the hard line on the right frame and drain the fuel into a suitable container.
If you've been smelling gas around your Corvette, your fuel lines are likely cracked and it's time to empty and replace your fuel tank.
Considering the youngest C3 Corvette is 36 years old, it is likely that your fuel tank has been damaged by rust and corrosion and needs to be emptied and replaced.
To remove your C3 Corvette fuel tank, first remove the two nuts on each side of the fuel tank support beam. Then, disconnect the fuel gauge wires going to the tank pick-up. Finally, with one person on each end of the tank, rotate the tank forward, lower it down, and pull it out.
