Sylvie Willis
Draining the fuel tank of a C6 Corvette ZR1 & Z06 is a relatively simple process, but it's important to take the necessary precautions. The procedure involves accessing the fuse box, manipulating the fuel pump, and ensuring the safe disposal of the fuel. One method is to use a wire or paperclip to connect the front passenger hole with the driver's side rear hole, starting the pump and draining the fuel into a container. Another approach is to disconnect the rear tank fuel lines and drain them. Before attempting any of these methods, it's crucial to consult a professional or a service manual to ensure the correct procedure is followed and to avoid any potential hazards.
How to Drain Fuel Tank C6
| Characteristics | Values |
|---|---|
| Easiest Method | Driving around for a few hours |
| Alternative Methods | Dropping the tank, burning the fuel, or siphoning it |
| Tools Required | Hose, wire or paperclip, gas container, pressure gauge |
| Steps | 1. Open the fuse box under the hood. 2. Pull the fuel pump relay. 3. Stick one end of a wire or paperclip into the passenger front hole and the other end into the driver's side rear hole to start the pump. 4. Ensure the hose is running into a gas container. |
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What You'll Learn
Draining fuel through the fuel rail
To begin the process, one must locate the fuel pump relay within the car. This component is crucial for activating the fuel pump and initiating the drainage procedure. The specific location of the fuel pump relay may vary between car models, so consulting the car manual or seeking advice from a mechanic can be beneficial.
Once the fuel pump relay is located, the next step is to connect a hose to the fuel rail. This hose will serve as the conduit for draining the fuel. Depending on the car's make and model, there may be different methods for attaching the hose to the fuel rail. Some cars have a Schrader valve or a similar port, while others might require a quick-connect fitting or an extension from the engine bay to a fuel container. It is important to ensure that the hose is securely attached to prevent any leaks during the drainage process.
With the hose in place, the next step is to activate the fuel pump to start draining the fuel. This can be achieved by hotwiring the fuel pump relay, which involves manually connecting a positive wire from the battery to a specific pole of the relay. This process bypasses the ignition and allows the fuel pump to run without starting the engine, reducing the risk of accidents. It is important to exercise caution when working with fuel and electricity, and if one feels uncomfortable, it is advisable to seek professional assistance.
After the fuel pump is activated, the fuel will start flowing through the hose and can be collected in a suitable container. It is important to ensure that the container is properly labelled and stored in a safe location away from any ignition sources. The drainage process may take some time, depending on the amount of fuel in the tank. Once the tank is empty, the hose can be disconnected, and the fuel pump relay can be returned to its original state.
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Disconnecting the fuel tank strap
To disconnect the fuel tank strap, you will need to first disengage the crossover tube connector position assurance (CPA) retainer by pulling the tab outward and rotating it. It is important to be cautious and not disturb the internal O-rings in the fuel tank connections. Once the latch is disengaged from the tank connection groove, rotate the crossover tube collar counterclockwise to complete the disengagement.
Next, you will need to disconnect the evaporative emission (EVAP) crossover pipe quick-connect fitting at the left fuel tank. To prevent any system contamination, be sure to cap the EVAP pipes.
Now, you can proceed to remove the fuel tank strap mount bolts. After removing the bolts, carefully remove the fuel tank strap from the vehicle.
It is important to follow these steps in the correct order to ensure the safe and proper disconnection of the fuel tank strap.
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Using a hotwire kit
The JMS Fuel Max and Racetronix Hotwire Kit is designed for C5 and C6 Corvettes. It can be used to overcome the losses associated with the factory wiring harness to the fuel pump. The heavy 12-gauge feed, sealed relay, and attachment to the output stud of the alternator increase both fuel volume and pressure.
To use a hotwire kit to drain the fuel tank of a C6, you will need to locate the fuel pump relay. This is relay #35 in the engine compartment. You can then wire up the hotwire kit. This involves running a wire from the alternator to the relay to jump the fuel pump on.
Before beginning the process of draining the fuel tank, you should ensure that your car is running. You will also need to purchase a pressure gauge and hook it up to the schrader valve. This will cost you around $30.
Once you have hooked up the pressure gauge, hold down the bypass button and drain the fuel into a small gas tank. This process should take around 15 minutes.
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Siphoning
To drain a C6 fuel tank through siphoning, you will need to access the fuel tank and pump out the fuel. Here is a step-by-step guide:
- Locate the fuel tank: The fuel tank in a C6 is typically located at the rear of the vehicle, underneath the trunk or rear seat. You may need to remove any covering or panelling to access the tank.
- Prepare the necessary tools: You will need a siphon hose or tube that is long enough to reach the bottom of the fuel tank and a container to collect the fuel.
- Insert the siphon hose: Carefully insert the siphon hose into the fuel filler hole or the fuel tank vent. It may be helpful to have an assistant guide the hose into the tank to ensure it reaches the fuel.
- Begin siphoning: Once the hose is in place, start siphoning by sucking on the end of the hose or using a manual or electric siphon pump. Be cautious when siphoning fuel, as it is highly flammable, and ensure you are in a well-ventilated area.
- Collect the fuel: Place the other end of the hose into your container, such as a gas can or bucket, and allow the fuel to drain into it. Ensure that your container is properly labelled and stored, following local regulations for fuel storage and disposal.
It is important to note that siphoning fuel can be dangerous, and you should take appropriate safety precautions. Always work in a well-ventilated area, avoid open flames or sparks, and wear protective gear, such as gloves and eye protection. Additionally, be cautious when disposing of the fuel to ensure it is done in an environmentally friendly manner.
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Driving until the tank is nearly empty
If you have the wrong fuel in the tank, do not start the car. In this case, you will have to use a different method to drain the tank. However, if you do not have the wrong fuel in the tank, turn the car on and run the gas down towards empty by driving around.
You could finish all the front-end work and then drive until you get to the reserve. Even at 1/8 of a tank, you will still have a lot of gas left when you swap the tanks.
Another method is to jump the pump and run the driver's tank dry. The passenger side will empty first, and the siphon to drain it into the driver's tank runs off the fuel pump. So, if you are using the pump, it will siphon out the passenger side until it is empty. To do this, remove the Schrader valve from the fuel rail fitting (front driver side) with a tire Schrader valve tool. Then, clamp a long section of hose to the outside of the Schrader valve fitting (long enough to reach your gas can for the transfer or into another car that has an empty tank). Finally, pull the fuel pump relay and jump out the fuel pump to turn the fuel pump on. This will drain the fuel out of the passenger side first, and then the driver's tank.
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Frequently asked questions
The three ways to drain a fuel tank are to drop it, burn it, or siphon it.
You can drain the fuel tank through the fuel rail by using a hotwire kit. You can also drain the tank by using a pressure gauge and hooking it up to the schrader valve.
You can hotwire the relay with a manually switched +12v to drain the fuel tank without turning on the ignition.
The easiest way to drain the gas tank in your Z06 is to drive around for a few hours.
