Draining The Fuel Tank Of A Chevy C10 Truck

how to drain fuel tank chevy c10

The Chevy C10 is a classic American truck that has gained a lot of respect from auto enthusiasts. However, it has several safety issues by modern standards, one of the most important being the location of the fuel tank. The original C10 models had the fuel tank located in the cab with the driver, increasing the risk of gas fume inhalation and fire in the event of a crash. To address this, many people choose to relocate the gas tank from inside the cabin to below the bed, between the frame rails. This article will discuss how to drain the fuel tank of a Chevy C10, as well as the benefits of relocating it.

How to drain the fuel tank on a Chevy C10

Characteristics Values
Year of Chevy C10 1981
Drain Plug Not available
Fuel Tank Location Inside the cabin
Method Use a siphon hose
Additional Steps Disconnect the hose from the pump

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Using a siphon hose

To drain the fuel tank of a Chevy C10, you can use a siphon hose. This method is useful if you need to empty the tank without dropping it.

Firstly, get the tank low enough so that you can pull the filler hose out. Then, insert a siphon hose into the tank and siphon the fuel out. Make sure that the tank you are putting the gas into is below the Chevy C10's tank. Start the fuel flow and let gravity do its work.

You can also use two tubes (around 1/2" ID, but this isn't critical). Push one of the tubes into the tank, below the fuel level, and the other end into the container where the fuel will go. The other tube should be inserted but not as far as the fuel. Wrap a rag around the two tubes at the tank filler neck and wedge it so that it temporarily forms an airtight seal. Then, blow down the tube. When the fuel starts flowing from the other tube, pull the rag clear and let the siphon do its work.

Alternatively, you can disconnect the fuel filter and pump the fuel out using an electric fuel pump and hoses.

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Disconnecting the hose from the pump

To disconnect the hose from the pump of your Chevy C10, you will need to follow a few steps. Firstly, locate the stock filler tank by pulling back the carpet slightly after removing the bolts at the base of the seat belts and the top shoulder bolts. Once you have accessed the stock filler tank, look for the hose clamp that connects the hard fuel line to the soft fuel line. You can use a screwdriver to remove the small screw on the hose clamp.

If you are simply looking to drain the fuel tank, there are a few methods you can use. One way is to use a siphon hose. Get the tank low enough so that you can pull the filler hose and insert a siphon hose to siphon the fuel out. Make sure the tank you are siphoning the fuel into is below the Chevy C10's tank. Start the fuel flow and let gravity do its work.

Another method is to use two tubes, each about 1/2" in diameter. Push one tube into the tank, below the fuel level, and place the other end into the container where the fuel will be drained. The second tube should also be inserted, but not as far so that it remains above the fuel level. Create an airtight seal at the tank filler neck by wrapping a rag around the two tubes and wedging it. Blow down one of the tubes, and when the fuel starts flowing from the other tube, remove the rag and let the siphoning continue.

If you are looking to replace the fuel pump, you can simply drop the tank with the fuel still in it and then remove the fuel pump.

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Using a squeeze bulb siphon hose

To drain the fuel tank of a Chevy C10 using a squeeze bulb siphon hose, follow these steps:

First, loosen the fuel filler cap to relieve the fuel tank's vapour pressure. Next, raise the vehicle and locate the fuel line. Disconnect the fuel line, which may require a special tool. You may also need to loosen the fuel fill hose clamp at the tank and disconnect the fuel fill hose from the fuel fill pipe.

Now, take your squeeze bulb siphon hose and stick one end into the fuel tank and the other end into a fuel canister. Ensure that the canister is below the tank to utilise gravity. Squeeze the valve on the siphon hose, creating suction to draw the fuel out of the tank and into the canister.

It is important to note that modern vehicles often have anti-siphon devices, so you may need to bypass this mechanism to access the fuel. One method is to use a longer hose to position the fuel canister further away from the vehicle. Drain a few gallons at a time, and always work with a cool engine to stay safe.

Additionally, consider using a thicker hose attached to the siphon hose to increase the flow rate, as the siphon hose is typically narrow. This process may take some time, but it is an effective way to drain the fuel tank of your Chevy C10 without removing the tank.

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Jumping the fuel pump relay

A bad fuel pump relay can prevent your Chevy truck from starting up properly. If that happens, you may need to jump it. Jumping or bypassing the fuel pump relay is useful, but it is not a long-term solution. If you regularly need to jump or bypass your Chevy truck's fuel pump relay, it's time to consider getting a new truck.

To jump the fuel pump relay, you will need a ratchet set, an open-ended wrench, and jumper cables. If you don't have jumper cables, you can use a 5-inch copper wire with a bit of insulation removed from each end. Once you have your tools, you can choose from one of two methods to get around a faulty Chevy truck fuel pump relay.

The first option is to jump your fuel pump relay using jumper cables. Start by finding the relay; it’s probably located by your fuse box or battery terminals (but double-check your owner’s manual to be sure). Then, carefully disconnect the battery terminals and remove the black negative cable. Next, carefully connect your jumper cables. Connect the red end of the jumper cable to the red battery terminal before connecting the black end to the black (or blue) terminal. Do not touch the terminals while in contact with any metal. Next, start your engine and let it run for about 15 seconds before turning off the ignition switch. Lastly, check your fuel gauge light to see if it turns green (this may take a little time, so be patient).

The second option is to bypass the fuel pump relay without using jumper cables. Start by disconnecting the 4-pin pump from the relay’s center. Next, using a 5-inch copper wire with about a ½ inch of insulation removed from each end, connect one end to the pin slot in the upper left corner of the pump relay center and the other end to the lower right corner of the pump relay center.

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Removing the tank

Removing the fuel tank on a Chevy C10 is a straightforward process, but it requires careful planning and preparation. Start by parking your truck on a level surface and engaging the parking brake. If you have a manual transmission, put it in first gear or reverse to prevent any accidental rolling. You will be working underneath the vehicle, so ensure the area is well-ventilated, and there are no sources of ignition nearby. Before beginning, allow the engine to cool down, and if you've driven recently, let the catalytic converter cool as well. Now, you can proceed to locate the fuel tank. It is positioned towards the rear of the vehicle, beneath the cabin. Place a jack beneath the truck bed and lower it onto jack stands for added stability. This will ensure your C10 is secure and reduce any potential movement while you work.

Once you have identified the fuel tank, you will need to disconnect the fuel lines and hoses that run to and from it. Start by loosening the clamp that secures the fuel hose to the tank using a screwdriver. Be gentle to avoid damaging the hose. You may need a wrench to loosen the hose clamp, depending on how tight it is. After that, carefully pull the hose away from the tank. There may be a small amount of fuel spillage, so have a rag or towel ready to catch any drips. Now, you will need to deal with the fuel lines that run from the engine to the tank. These lines will be connected to the fuel pump and will need to be carefully disconnected. Start by locating the fuel filter, which should be near the tank.

There will be an inlet and an outlet line connected to the filter. Use a line disconnect tool to separate these lines gently. If you don't have a line disconnect tool, you can carefully use a small flathead screwdriver to release the lines. Be very careful not to damage the lines or the connectors. With the lines disconnected, you can now remove the fuel pump. It is held in place by a bracket and a series of bolts. Remove these bolts and gently lift the pump out of its housing. Place the pump and its lines aside, ensuring they are secure and cannot be damaged. At this point, it is critical to ensure that you have rags or towels ready to catch any fuel that may spill.

Now, return to the fuel tank and remove the straps that hold it in place. These straps should be located at the front and rear of the tank. They are usually secured with bolts, so use your wrench or socket set to remove them carefully. With the straps removed, the fuel tank is now ready to be lowered. Carefully maneuver the tank out from under the vehicle. This may require an assistant as the tank will be heavy and awkward to handle. Once the tank is out, place it on a flat, stable surface, and you can now access the fuel sender and pump assembly for maintenance or repair. Remember to recycle or dispose of the drained fuel responsibly.

Frequently asked questions

There is no drain plug for the Chevy C10, so you will have to drop the tank and drain it that way. You can also use a siphon hose to suck the fuel out.

You can try jumping the fuel pump relay, or taking the fuel filter off and pumping it out using an electric fuel pump and hoses.

A squeeze bulb siphon hose is a cheap investment ($10) that will help you drain your fuel tank.

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