Sylvie Willis
The fuel tank in a Mercedes Benz C230 is responsible for storing engine fuel and is typically made of metal or plastic. It is mounted to the bottom rear of most vehicles. Over time, a fuel tank may corrode and start leaking, leading to a potential fire hazard. If you notice a gas smell or gas pooling underneath the tank, it is important to get it inspected by a mechanic. While a DIY approach can be taken to replace a fuel tank, it is important to have adequate knowledge of safety procedures. This article will provide a step-by-step guide on how to clean and maintain your C230 fuel tank, ensuring the optimal performance and safety of your vehicle.
| Characteristics | Values |
|---|---|
| Fuel tank replacement cost | $2,212 to $2,437 |
| Fuel tank capacity | 8 gallons |
| Fuel tank location | Mounted to the bottom rear of the vehicle |
| Fuel tank function | Stores engine fuel |
| Fuel tank system | Part of the evaporative emissions control system and the fuel delivery system |
| Fuel tank filling | Fuel is filled through the fill spout which connects to the fuel tank filler neck |
| Fuel tank sensors | Mechanical float that reads fuel level |
| Fuel tank issues | Fuel tank leaks, corrosion, punctures |
| Fuel tank repairs | DIY possible but working knowledge of electricity and fuel components is required |
| Fuel tank cleaning products | Seafoam, injector cleaner |
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What You'll Learn
Drain contaminated fuel
Draining contaminated fuel from your C230 fuel tank is a crucial maintenance task that ensures the longevity and performance of your vehicle. This process involves removing old, contaminated, or unused fuel, which can prevent engine problems and improve fuel efficiency.
Before you begin, ensure you have the necessary tools for the job. You will need a siphon pump (hand-operated or electric) and a fuel container made of a material safe for storing flammable liquids. Additionally, it is important to work in a well-ventilated area as the fuel tank will be open, releasing harmful fuel vapours.
To drain contaminated fuel from your C230 fuel tank, start by relieving the fuel pressure. Disconnect the electrical plug from the top of the fuel pump unit and let the car run until it shuts off. Then, unplug all connections to the level sending unit. Remove the clamp from the locking ring using a 7mm socket, and loosen it enough to take it off. Use a flathead screwdriver to help remove the clamp if needed. Spread the locking ring and pull it off the fuel pump assembly, then partially pull the assembly out of the tank. As you do this, the assembly will want to separate into two pieces. Disconnect the electrical connection from the top piece and remove it from the tank. Finally, disconnect the three hoses and the remaining harness plug from the assembly.
Alternatively, you can try draining the fuel through the ports. However, this method may not remove all the fuel, and you will still need to remove the sensors. There will be fuel left in the bottom recesses of the tank, which you can mop up with a sponge. You can also try to disconnect the discharge side hose of the fuel pump and manually activate the pump to remove the remaining fuel.
Another option is to use a hose to siphon the fuel out of the tank. Locate the larger rubber tube between the tank and the fuel pump on the passenger side, rear of the tank. Be prepared to catch the draining fuel.
Remember to always exercise caution when handling contaminated fuel and follow safety protocols.
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Clean fuel lines and injectors
To clean the fuel lines and injectors of a C230, you will first need to drain the fuel tank. This can be done by inserting a hose into the tank and siphoning the fuel out. You can also try to locate and use the M-B tool that fits onto the drain ports to suck the fuel out. Once the tank is drained, you can begin cleaning the fuel lines and injectors.
One method is to use a can of Seafoam, which can be hooked up to a vacuum line going into the intake lines. Allow the Seafoam to work for about 5 minutes, then rev the engine in neutral to blow out the carbon buildup. You can also add Seafoam directly to your fuel tank, oil reservoir, and intake lines to help clean them.
Another method is to use a fuel injector cleaner. There are various brands available, including 3M. These cleaners can be added to the fuel tank to help clean the injectors and fuel lines.
It is important to note that working with fuel can be dangerous, and proper safety precautions must be followed. It is always best to consult a professional technician if you are unsure about any part of the process.
Additionally, keeping your fuel tank and fuel system well-maintained is crucial. The functionality of the fuel system directly impacts the performance of your vehicle. A dirty or contaminated fuel tank can cause various issues, including a decrease in fuel economy and potential engine problems. Regular inspections and repairs can help prevent larger issues from occurring and ensure the safety of you and your passengers.
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Disconnect electrical plug from the fuel pump unit
Before removing anything from the tank, it is important to relieve the fuel pressure. This is done by disconnecting the electrical plug from the top of the fuel pump unit and starting the car. Allow the car to run until it shuts off.
Now, you can head back to the sending units and unplug all connections to the level sending unit. The fuel pump assembly and fuel level sending unit are easily accessible under the rear seat. You may have to remove some brittle plastic coverings.
Next, head over to the fuel pump unit and remove the clamp from the locking ring. Use a 7mm socket to loosen the clamp enough to remove it. A flathead screwdriver can help to pry on the clamp.
Now, spread the locking ring and pull it off of the fuel pump assembly. Then, pull the fuel pump assembly out of the tank, partway. As you do this, the assembly will want to separate into two pieces.
Finally, disconnect the electrical connection from the top piece and then remove it from the tank.
Please note that replacing the fuel pump or any part of the fuel level sending assembly can be done with a few hand tools and some basic working knowledge of electrical and fuel components. However, if you feel that you are unqualified for this task, it is best to leave it to a professional technician.
Additionally, if you are experiencing issues with contaminated fuel, fuel leaks, or poor engine performance, it is important to consult a mechanic for a thorough inspection and appropriate repairs.
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Remove sensors and mop up remaining fuel
Before removing the sensors, you must relieve the fuel pressure. To do this, disconnect the electrical plug from the top of the fuel pump unit and start the car. Let the car run until it shuts off, then head back to the sending units and unplug all connections to the level sending unit.
Now, you can remove the sensors. There will still be quite a bit of fuel left in the tank when you do this, so be prepared. The shape of the tank makes it necessary to remove both sensors. After the sensors are out, there will still be fuel left in the bottom recesses of the tank. This can be mopped up with a sponge.
There are hose assemblies inside the tank that connect the sensors. These remain after the sensors are removed, so be careful not to spill any remaining fuel.
It might be worth trying to disconnect the discharge side hose of the fuel pump and manually activate the pump to pump the tank down. However, this is a complicated process, and if you feel that you are unqualified for this task, it is best to leave it to a professional technician.
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Repair or replace a corroded or leaking gas tank
If you have a leaking gas tank, it is important to get it fixed as soon as possible to avoid dangerous consequences such as fires or explosions. You can either take it to a repair shop, or fix it yourself.
Repairing a Leaking Gas Tank
First, jack up the car and place jack stands underneath the vehicle. Once the car is safely resting on the jack stands, crawl under the vehicle and inspect the gas tank to find the area where the tank is leaking. Sand the area surrounding the hole or leak in the gas tank. Use a towel and alcohol, or another degreaser, to thoroughly clean the area that has been sanded, removing any dirt, grease or grime. Mix an epoxy compound following the manufacturer's instructions. Shape the epoxy compound into a small cone and insert the tip of the cone into the hole in the gas tank. Once the epoxy compound has dried and cured, fill your car's gas tank and check for leaks.
Other Repair Options
If you have a leaking metal gas tank, there are ways to repair it without welding. First, remove the rubber cover in the gas cap area, along with the gas cap. Lower the tank and tape up any lines where dirt can risk falling inside of the tank. Clean up the dirt from the tank using a vacuum and a soft wire brush. You can also use a heat gun to soften any wax coating, and a plastic scraper to remove it. Once the tank is clean, reinstall it in reverse.
Replacing a Gas Tank
If your gas tank is over two decades old, it is better to replace it. Additionally, if you see signs of corrosion, you should replace the tank. The average range for replacing a fuel storage tank is between $1,607 and $2,655. However, repairing your storage tank is a more cost-effective option, allowing you to allocate your budget to other important things.
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Frequently asked questions
If you notice a strong fuel smell inside the car cabin, this could indicate a crack around the top of the fuel tank. Another sign is an incorrectly reading fuel gauge.
First, relieve the fuel pressure by disconnecting the electrical plug from the top of the fuel pump unit and starting the car. Let the car run until it shuts off. Then, remove the sensors and mop up the remaining fuel with a sponge.
Yes, but you should have a working knowledge of fuel and electrical components, as well as safety procedures. If you feel unqualified, it is best to leave it to a professional technician.
