Regan Brown
Cleaning an E30 fuel tank is a complex process that requires careful attention to detail. The fuel tank is susceptible to rust and debris build-up, which can lead to fuel pump issues and engine problems. To clean the fuel tank, one must first drain the tank and remove it from the car. This involves jacking up the car, draining the fuel, and disconnecting various components such as the exhaust, fuel lines, and wiring plugs. Once the tank is removed, it can be cleaned and coated to prevent rust. Additionally, the fuel injectors should be cleaned using brake cleaner and compressed air, and new seals should be installed. Reinstallation involves reconnecting fuel lines and wiring plugs, ensuring a proper seal, and bleeding the fuel system to remove any air. Proper safety precautions, such as avoiding smoking and wearing eye protection, are crucial when working with the fuel system.
Characteristics and Values table for cleaning an E30 fuel tank
| Characteristics | Values |
|---|---|
| Reason for cleaning | Fuel injectors are clogged, causing the car to run sluggishly |
| Tools/Materials | Jack and jackstands/ramps/inspection pit, Allen key, vice grips/mole grips/self-locking pliers, flashlight, brake cleaner, soft brush, compressed air, goggles, new fuel injector seals, engine oil, paper towels, small vacuum |
| Steps | 1. Drain the fuel tank. 2. Remove the exhaust. 3. Remove metal strips in front of the tank. 4. Lift the rear seat and carpet, then unscrew the access panels. 5. Disconnect fuel lines and wiring plugs. 6. Remove bolts and nuts from the fuel tank. 7. Remove the fuel tank and clean it with a brush and brake cleaner. 8. Reinstall the fuel tank and connect the fuel lines and wiring plugs. 9. Clean the injectors with brake cleaner and compressed air. 10. Install new fuel injector seals and secure them with engine oil and retaining clips. 11. Clean the area around the injector ports with brake cleaner and a small brush. 12. Plug each injector port with paper towels and vacuum out any remaining dirt. |
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What You'll Learn
Removing the fuel tank
To remove the fuel tank from your E30, start by getting the car in the air using jack and jack stands, ramps, or an inspection pit. Remember to avoid smoking while working with the fuel system. Drain the fuel tank using the drain plug on the driver's side, which may require an Allen key. If you're worried about damaging the Allen key, use a pair of vice or mole grips, or self-locking pliers to turn it.
Next, remove the exhaust when it's cool. There may be two metal strips just in front of the tank (air deflector plates) that need to be removed as well. They are typically held in place with plastic nuts and a screw. If the screw won't come out, try pulling the strip down slightly.
Lift or remove the rear seat and the carpet to access the fuel tank. You will find one or two access panels that need to be unscrewed. Underneath, you will find fuel pipes and electrical connections. Undo the wiring plugs.
Now, you can start removing the bolts holding the fuel tank in place. Undo the bolt above the fuel filter and the bolt/nut on the other side of the tank. It is recommended to remove the two bolts at the back of the tank (above the rear beam) first, then support the tank before removing the final nut in the centre at the front. With all the bolts removed, carefully fiddle with the tank to completely remove it.
Once the fuel tank is out, you can clean or sweep the top to remove any dirt or debris. Remove the metal-sleeved rubber grommets and fit them to your new or cleaned tank.
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Cleaning the injectors
Step 1: Remove the Injectors
Start by removing the injectors from the fuel rail. No other parts need to be removed to access the fuel rail. Once the injectors are out, use a rag to wipe off any visible build-up of carbon deposits, fuel additives, and gas.
Step 2: Clean the Injectors Externally
Spray the outside of the injectors and the tips with a can of brake cleaner. Use a soft brush to gently remove any remaining grime from the tips.
Step 3: Clean the Injectors Internally
Spray a small amount of brake cleaner down the inside of each injector. Then, blow them out with compressed air. Each injector has a small filter that collects debris and crud from the fuel system. Spraying brake cleaner inside will dissolve any deposits. Continue spraying and blowing out with compressed air until the brake cleaner that comes out is clear, indicating that the injectors are clean. Remember to wear goggles during this step, as the compressed air will cause the cleaner to spray everywhere.
Step 4: Reinstall the Injectors
Get new fuel injector seals and place them on each end of each injector. Reinstall the injectors by pressing them back into the fuel rail with a small amount of engine oil, which will help seal them. Reattach the fuel lines, vacuum hoses, and electrical connectors.
Additional Tips:
- It is recommended to change the fuel filter after cleaning the injectors.
- Some people suggest using a fuel injector cleaner additive, such as Chevron Techron, before replacing your injectors.
- If you notice a hesitation around 4000 rpm, cleaning the injectors can help improve throttle response and make the car feel "'snappier."
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Draining the tank
To drain the tank, first get the car in the air. You can do this with a jack and jack stands, using the approved jacking points, or use ramps or an inspection pit. Run the car until you have less than a quarter tank of fuel in there. This will reduce the overall amount of fuel pressure in the system and help prevent raw fuel from gushing out when you remove the injectors.
The fuel tank should have a drain plug on the driver's side. You will need an Allen key (5 or 6mm) to open it. If the Allen key is going to get ruined, use a pair of vice or mole grips, or self-locking pliers to turn it.
Before you start, remove the rear seat and lift the carpet to reveal one or two access panels. Unscrew these. Beneath these, you will find fuel pipes and electrical connections. Undo the wiring plugs.
Now, remove the hose clamp holding the fuel line to the fuel pressure regulator and plug the fuel line using a bolt. Disconnect the vacuum hose at the top of the regulator. Look at the rear of the engine on the passenger side, right above the valve cover. You will see the connection for the rear fuel line. Loosen the hose clamp that holds it to the fuel rail and remove the fuel line. Plug the end of the fuel line with a bolt. Be prepared for some raw fuel to spill out of the lines. Just have a rag nearby to clean the fuel up.
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Flushing the system
To flush the system, you must first drain the tank from the bottom. Use an Allen key to remove the drain plug on the driver's side. If the Allen key is going to be ruined, use a pair of vice or mole grips, or self-locking pliers to turn it. Once the tank is drained, use a flashlight to look inside and check for rust.
If there is rust, the tank must be removed and replaced. If there is no rust, the system can be flushed with good gas until it runs clear. To do this, run the pump and put the return line into a bucket. Be prepared to drop the tank, as it may be necessary.
If you are experiencing problems with your fuel injectors, you can clean them by first removing them and wiping off any visible build-up of crud—a mixture of carbon deposits, fuel additives, and gas—with a rag. Then, spray the outside of the injectors and the tips with brake cleaner and use a soft brush to remove any remaining grime. Spray some brake cleaner down the inside of each injector and blow them out with compressed air. Keep doing this until the brake cleaner comes out clear.
Finally, install new fuel injector seals on each end of each injector and press them back into the fuel rail. Reinstall the retaining clips to secure the injectors. Plug each injector port with a small piece of paper towel, then clean the area around the injector ports with brake cleaner and a small brush. Remove the paper towels and check for any remaining dirt. If there is any dirt, use a small vacuum to suck it out.
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Refitting the tank
Next, drain the tank from the bottom. Use an Allen key to remove the drain plug on the driver's side. If the Allen key is likely to be ruined, use a pair of vice grips, mole grips, or self-locking pliers to turn it. Once the tank is drained, remove the exhaust.
Now, you can begin the process of refitting the new or cleaned tank. First, remove the metal strips in front of the tank (air deflector plates) and the rear seat. Lift the carpet to reveal the access panels, and unscrew these. You will now be able to access the fuel pipes and electrical connections. Disconnect the wiring plugs and fuel lines.
When the new or cleaned tank is in position, connect the fuel lines on top of the tank to those still on the car. Jubilee clips are faster and easier for this than the original clips. Refit the wiring plugs to the fuel pump and sender units. Ensure that any new seals are fitted.
Finally, check that everything is secure and correctly connected. Lower the car and ensure that it is stable and secure before starting the engine.
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Frequently asked questions
If your car is running sluggishly or you notice a stumble as you drive, your fuel tank and injectors may need cleaning.
First, run your car until you have less than a quarter tank of fuel. Drain the tank from the bottom. Use an Allen key to remove the drain plug on the driver's side. Remove the fuel injectors and use a rag to wipe off any crud from the tips. Spray the injectors with brake cleaner and scrub them with a soft brush. Spray cleaner down the inside of each injector and blow them out with compressed air. Repeat until the cleaner comes out clear.
It is crucial to remember not to smoke while working on the fuel system. Additionally, always wear protective goggles when using compressed air and brake cleaner to avoid eye irritation.
You will need an Allen key, vice grips or mole grips, a screwdriver, compressed air, brake cleaner, a soft brush, rags, and new fuel injector seals.
Regularly check your fuel quality and inspect your fuel tank for any signs of rust. Ensure that your fuel tank is properly sealed to prevent debris and moisture from entering.
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