How to Drain an Evo 8 Fuel Tank

Draining your fuel tank can be a real headache if you do not know the path. Most people think it takes a shop visit, but you can do it at home. I will show you how to safely clear your fuel lines and empty that tank without making a massive mess today.

You need to disconnect the fuel feed line under the hood. Attach a piece of rubber hose to the end of the line. Run the other end into a safe gas can. Use a jumper wire on the fuel pump relay to force the pump to run. Keep an eye on it.

Reasons for a Fuel Flush

You might need to empty the tank when the car sits too long, or maybe you filled it with bad gas. Old fuel turns into varnish, and that gunk will clog your injectors fast. Do not ignore the symptoms if the engine runs rough or fails to start at all.

Old Fuel Contamination

Gasoline goes bad after a few months in the tank. It loses its punch and leaves behind sticky residue. This gunk ruins your fuel system components if you keep running it. You need fresh fuel to keep the car happy, and you must clear the system before things break down.

Bad Fuel Quality

Sometimes the pump station gives you dirty fuel. Water or dirt in the mix will cause your engine to stumble, and that is a bad sign for your internals. If you suspect bad gas, get it out before it hits the combustion chamber. Clean fuel is the only way forward.

Fuel System Upgrades

Swapping out your old fuel pump for a bigger one means the tank must be empty first. You cannot work on the pump while gas sits in the tank. It is a messy job, but it helps you do the work right. Take your time and keep the workspace clear.

Winter Storage Prep

If the car stays in the garage all winter, you should drain the tank. Ethanol in modern fuel absorbs water, and that causes rust inside the metal lines. Filling the tank with fresh fuel and stabilizer works too, but draining it is the best way to prevent any long-term issues.

Leaking Fuel Lines

Damaged lines mean you have a fire risk under the car. You must empty the tank before you pull those lines off. Never try to patch a line while gas is still under pressure. Safety comes first here, so clear the tank before you touch any of the rusted connections.

Pump Replacement Tasks

When the stock pump gives up, you have to get to the tank. It sits right behind the rear seats, and the access cover is tight. Get the level as low as possible to keep spills to a minimum. A near-empty tank makes this job much easier for you.

You should always have a fire extinguisher nearby when you mess with fuel. It is better to be safe, because gas fumes catch fire in an instant.

• Work in a well-ventilated area.
• Disconnect the battery negative terminal.
• Wear gloves to protect your skin.
• Have plenty of rags ready.
• Keep the area free of sparks.
• Label every line you remove.

How to Drain an Evo 8 Fuel Tank Safely

Getting that gas out of your tank does not have to be a struggle. You just need to use the car’s own pump to do the heavy lifting for you. It beats crawling under the car to pull a plug that might not even exist on this model.

Safety Precautions First

Safety is your priority when you deal with volatile liquids. Park the car on a flat surface, and engage the parking brake. You must have a fire extinguisher sitting right next to you at all times. Do not light a cigarette, and keep your phone far away from the car.

Wear safety glasses to stop stray fuel from hitting your eyes. Gasoline stings, and it can cause lasting damage if you are not careful. Use a shop fan to move the air, and never work in a closed garage. Keep your pets and children far away from the work area.

It is a simple process, but you need to be alert. Treat every drop of fuel like a potential fire hazard. If you feel nervous, take a break and double check your plan. Rushing through the job leads to mistakes that you really want to avoid in your driveway.

Locating the Fuel Line

The fuel feed line is easy to find in the engine bay. Look for the hard metal line that leads to the fuel rail. It usually has a quick-connect fitting that keeps it held tight. You need to undo the clip carefully to release the metal fitting from the rail.

Be ready for a small spray of fuel when you pop the clip off. Wrap a clean shop rag around the fitting to catch the initial splash. Once it is free, you can attach your extension hose. Make sure the connection is snug, because you do not want it popping off.

Secure the hose with a small clamp if you can. A loose hose will spray gas all over your engine bay, and that is not what you want. Double check that the hose reaches your gas can comfortably. It should not be stretched tight or kinked in any way.

Jumping the Fuel Pump

You need to force the fuel pump to turn on without starting the engine. Find the fuel pump relay in the box near the battery or firewall. You can pull the relay out and jump the two pins that feed power directly to the pump. That makes the pump run.

Use a sturdy wire to bridge the gap. You should hear the pump humming immediately as the gas starts to flow. Listen to the sound of the pump. A healthy pump has a steady whine, but a dying pump sounds like it is straining to push the liquid out.

Keep a close eye on the gas can as it fills. Do not let it overflow, because that creates a huge mess. If the pump stops or sounds weird, kill the power immediately. You might have hit the bottom of the tank, so check the fuel level gauge.

Monitoring the Flow

Watch the fuel flow into the container carefully. You want a steady stream without too many bubbles. If the flow slows down, the pump might be struggling to pick up the last bit of gas. That is a normal sign that the tank is getting very low now.

Do not let the pump run dry for too long. Running a fuel pump without gas cools it down poorly, and you can burn the motor out. Once you hear the pump pitch change, kill the power to the pump. That indicates the tank is basically empty at this point.

If you still need to get every last drop, you have to pull the pump assembly out. That involves removing the rear seat and the access panel. It is a much larger job, but it is necessary if you need to clean the tank out.

Handling the Excess Fuel

Once the tank is empty, you need to deal with the old gas. Do not pour it down the drain or into the grass. It is toxic, and it will kill the plants or pollute the water. Take it to a local shop or a recycling center that handles chemical waste.

Keep the gas in a sealed container until you reach the disposal site. Label the container clearly so no one drinks it or pours it into a lawnmower. Old fuel can gum up a lawnmower engine in a hurry, so just get rid of it the right way.

If the gas is still clean, you might be able to put it into an older, less sensitive vehicle. Check with a friend first. Never try to reuse bad fuel in your car, because the engine will hate it. Stick to fresh fuel for your high performance machine.

Reconnecting the Lines

Reattaching the fuel line is just as important as taking it off. Push the fitting onto the fuel rail until you hear the click. Tug on it lightly to make sure it is locked. A loose connection will cause a massive leak as soon as you turn the key.

Wipe down any spilled fuel with a rag. Check the connections one more time. Pour a little water on any spots where gas spilled to dilute the residue. If you smell gas when you start the car, shut it off right away and check the line fitting again.

Start the car and let it idle for a minute. Watch the line for any wet spots or drips. If everything looks dry, you are ready to hit the road. It feels good to know you did the work yourself without needing a shop to help you.

Draining the tank is a messy but simple task that saves you a lot of time. Just remember that patience is key when working with fuel systems.

• Use high quality fuel hose.
• Check for leaks after starting.
• Keep the work area clean.
• Dispose of gas properly.
• Secure the line clips tightly.
• Never rush a fuel job.

What Happens If the Fuel Pump Dies?

If the fuel pump dies, the car will just stop running on you. You might notice the car hesitating when you hit the gas pedal. That usually means the pump is failing to keep up with the fuel pressure. Replacing the pump is the only fix for this specific problem.

Sometimes a bad relay mimics a dead pump. Always check the relay before you pull the whole fuel tank apart. A cheap relay can stop the pump from turning on. If you replace the relay and the pump still stays quiet, then the pump is likely the real culprit.

You will have to drain the tank to swap the pump out anyway. It is a big job because of the access panel location under the rear seat. Make sure you have a new gasket for the fuel pump cover, because the old one will leak if you try to reuse it.

• Check the fuel pump fuse.
• Listen for the humming noise.
• Test the relay with a multimeter.
• Check the wiring for corrosion.
• Use a high flow replacement pump.
• Replace the O-ring seal.

Can You Use a Siphon to Drain the Tank?

Siphoning is a way to empty the tank, but it does not work on all cars. Some fuel tanks have a rollover valve or a tight filler neck design. That prevents you from pushing a hose all the way into the gas. You will just get the hose stuck in the neck.

If you really want to siphon, use a dedicated pump tool instead of a garden hose. These tools have a thin tube that is easier to feed into the tank. Even then, you might not reach the bottom corner of the tank. You will always have a little bit left behind.

Siphoning is also slow, and you have to watch the hose for leaks. If you suck on the hose to start the flow, you risk getting gas in your mouth. That is a dangerous mistake. Use a hand pump tool to avoid touching any fuel with your hands or mouth.

• Use a hand-operated siphon pump.
• Never use your mouth for suction.
• Check for tank baffles inside.
• Move the hose around slowly.
• Wear gloves during the process.
• Have rags ready for drips.

How Long Does a Fuel Pump Last?

Most fuel pumps last over one hundred thousand miles if you take care of the car. The biggest killer of these pumps is running the tank empty. The gas keeps the pump cool, and when the level is low, the pump works much harder to push fuel.

I noticed that people who drive with the light on often end up with a dead pump. You should try to keep at least a quarter tank of gas in the car at all times. That extra fuel helps the pump stay cool and keeps the debris from being sucked up.

If you hear a loud whining sound coming from the back seat, that is a warning sign. Your pump is likely on its way out. Do not wait for it to strand you on the side of the highway. Start planning for a replacement before the car fails to start.

• Avoid driving on E.
• Listen for abnormal pump noises.
• Change the fuel filter often.
• Use top tier fuel brands.
• Inspect the pump wiring periodically.
• Keep the fuel system clean.

Is It Safe to Leave the Tank Empty?

Leaving the tank empty for a long time is not a good idea. Metal tanks can start to rust from the inside out when they are dry. The moisture in the air condenses on the cold metal walls, and that leads to rust particles in your fuel system later on.

Plastic tanks are better, but they can still have issues with fuel sensor corrosion. If you need to store the car, it is better to fill the tank up with fresh gas and a stabilizer. That keeps the system pressurized and stops the air from causing any rust issues inside.

If you must drain it, seal the filler neck and the lines. You want to stop fresh air from getting inside the tank. Even then, do not leave it dry for years. Moisture is the enemy of any car that is sitting still for a long time in the garage.

• Use a fuel stabilizer additive.
• Keep the tank mostly full.
• Seal the filler neck properly.
• Check for rust inside occasionally.
• Avoid long term dry storage.
• Use a cover for the car.

Final Thoughts

I hope this guide helps you get that fuel tank drained without any trouble. It is a dirty job, but you will feel great once you finish it on your own. Just take your time, keep those rags ready, and always prioritize your safety above everything else. You can do this!

Frequently Asked Questions

Is It Safe to Drain the Fuel Tank Alone?

Yes, you can do it alone if you have the right tools and a clear plan. Just make sure someone knows what you are doing, and keep a fire extinguisher within reach. Never work in a closed space because fumes build up fast.

Can You Reuse the Old Fuel?

You should only reuse the fuel if it is fresh and clean. If the gas smells like sour paint, dump it at a recycling center. Using bad gas will cause engine knock, and that will destroy your pistons in no time at all.

Are There Any Hidden Fuel Drain Plugs?

No, the Evo 8 does not have a drain plug on the bottom of the fuel tank. You must use the pump method or remove the pump assembly from the top to empty the tank. Do not try to drill a hole in the tank.

Do I Need to Disconnect the Battery?

Yes, you must disconnect the negative terminal before you open the fuel system. A spark from a tool hitting a ground can ignite the fumes. It is a small step that keeps you safe from a fire in the driveway.

Should I Change the Fuel Filter Too?

It is a great idea to change the filter if you are draining the tank. The filter catches all the gunk that you are trying to flush out. A fresh filter keeps your engine running smooth after you refill the system.

Will the Check Engine Light Come On?

You might see a light if the system detects low fuel pressure or an open circuit while you jump the pump. The light usually goes away once you connect everything back and drive for a few miles to reset the system.

Can I Use a Vacuum Pump Instead?

You can use a vacuum pump, but it is much slower than the car’s own fuel pump. The factory pump is designed to move a lot of fuel quickly. Just be careful not to run the factory pump dry for too long.

Does the Fuel Pump Relay Need a Special Tool?

No, you can pull the relay out with your fingers or a pair of pliers. It sits in a standard fuse box. Just make sure you put it back in the right spot when you finish the job so the car starts.