Ameer Randolph
The fuel distributor in a 1998 560 SEL can be removed, taken apart, inspected, rebuilt (new o-rings) and reinstalled, or replaced if bad gas has damaged internal components that o-rings can't fix. This can be done by taking the distributor apart and cleaning the internals, or by purchasing a replacement.
| Characteristics | Values |
|---|---|
| What to do if the fuel distributor is not the problem | Replace the fuel accumulator, filter and the relay |
| What to do if the fuel distributor is the problem | Get a replacement first, then take the distributor apart, clean the internals, and balance the distributor with an odd-sized Allen key |
| How to tell if the fuel distributor is the problem | Get a pressure tester to isolate the problem |
| Where to get a replacement | Mercedes-Benz, eBay, or Adsit |
| Cost of replacement | $650-$3600 |
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What You'll Learn
How to clean a fuel distributor
To clean a fuel distributor, you will need to take the distributor apart. An ultrasound washer would be ideal for cleaning the internals, but this is not essential. You will also need an odd-size Allen key to balance the distributor.
The process is time-consuming and requires patience. You will need to take the distributor in and out of the car several times. If there is no O2 sensor, it will be difficult to tell which port has the correct flow.
If the fuel distributor is damaged, you can buy a replacement online.
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How to balance a fuel distributor
To balance the fuel distributor on a 1998 560 SEL, you will need an odd-sized Allen key and a lot of patience and time. You will need to take the distributor in and out of the car several times.
It is recommended that you clean the internals of the fuel distributor before attempting to balance the flow. You can measure the fuel flow from the fuel distributor outlets using self-made measuring devices. You can make multiple measurements using different flow amounts.
If you don't want to do the job yourself, you can buy a refurbished fuel distributor. However, there is about a 50/50 chance that the distributor will still need calibration after cleaning and refurbishment. German spob sells refurbished and calibrated distributors for about 600€.
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How to check for bad gas
I could not find specific instructions on how to replace the fuel distributor in a 1998 560 SEL. However, I did find some general information on replacing fuel distributors, as well as some tips on how to check for bad gas.
If your car has been sitting for a long time – at least a year – it is a good idea to check the contents of the gas tank before starting the engine. You can do this by using a gas siphon pump to take a small amount of gasoline from the tank and putting it into a container. You only need to take enough to visually inspect it. If the gasoline is murky, brown, has deposits in it, or doesn't smell like it should, it has probably gone bad. You can also pour a small amount of gasoline onto concrete outdoors and try to light it with a long-reach lighter. If it doesn't burn explosively, it may be bad. Another way to check for bad gas is to test the water content. Pour some gas into a clean, empty glass container and check if there is a higher than usual concentration of water. If there is, the gas is bad and the tank will need to be drained.
Replacing the fuel distributor
Before attempting to replace the fuel distributor, it is recommended to clean the internals. To do this, you will need to take the distributor apart. An ultrasound washer is ideal for cleaning. To balance the distributor, you will need an odd-sized Allen key. It is also a good idea to get the replacement part first.
Other possible issues
If your 1998 560 SEL is experiencing problems, it may be due to issues with other components of the fuel system. One user reported that they replaced both fuel pumps, the EHA, all injectors, the filter/strainer inside the fuel tank, and the air hoses that connect to the injector holders, and this fixed the problem. Another user found that replacing the fuel accumulator, filter, and relay fixed the problem, without needing to replace the fuel distributor.
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How to replace fuel pumps
To replace the fuel pumps in a 1998 560 SEL, you will need to remove the old pumps and install new ones. Here is a step-by-step guide:
- Purchase new fuel pumps that are compatible with your vehicle. Make sure to buy high-quality pumps to ensure reliable performance and longevity.
- Locate the fuel pumps in your engine bay. They are usually located near the fuel tank or close to the engine, depending on your vehicle's configuration.
- Disconnect the negative battery terminal to prevent any accidental electrical shorts during the replacement process.
- Relieve the fuel system pressure by removing the fuel pump fuse or relay and running the engine until it stalls. This will ensure that there is no residual pressure in the lines when you start working.
- Drain the fuel tank to avoid spilling fuel during the replacement process. Use a siphon pump or a suitable container to carefully drain the fuel into a safe container.
- Disconnect the fuel lines and electrical connectors from the old fuel pumps. Label each line to ensure proper reconnection during installation.
- Remove the mounting bolts or brackets holding the old fuel pumps in place. Carefully lift out the old pumps and set them aside.
- Clean the mounting surface and inspect it for any signs of damage or leaks. Ensure that the area is free of debris and residue.
- Install the new fuel pumps by positioning them securely in place and tightening the mounting bolts or brackets.
- Reconnect the fuel lines and electrical connectors to the new fuel pumps, ensuring that they are securely attached and properly routed.
- Reinstall the fuel pump fuse or relay and reconnect the negative battery terminal.
- Refill the fuel tank and check for any leaks around the fuel pumps and lines. Start the engine and verify that the new fuel pumps are functioning correctly.
Note: It is recommended to refer to your vehicle's repair manual or seek assistance from a qualified mechanic if you are unsure about any steps or procedures.
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How to replace the fuel accumulator
To replace the fuel accumulator, you will need to ensure that there is limited gas in the line or prepare the line shut to keep it from having gas run out of it. It is also important to have a fire extinguisher handy, and either wear a long-sleeved shirt with the cuffs buttoned or tie a shop towel around your wrists, as you are likely to spill some fuel.
To remove the old accumulator, you will need to use a razor blade or similar sharp tool to gently cut into the cloth wrapping and through the plastic core to free it from the barbed fitting. The end that connects to the accumulator is held on with a simple clamp, but the other end is pressed onto a barbed fitting that is tightly screwed onto the hardline.
Once the old accumulator has been removed, you can install the new one by slipping a new, modern rubber fuel injection line onto the barbed fitting and tightening it down with a clamp.
If the replacement is being made recently after the car has been run, it is important to slowly depressurise the system by opening the connection to the top of the fuel accumulator slowly and carefully to prevent fuel from flying everywhere.
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Frequently asked questions
If your fuel distributor has unequal flow, it may need to be replaced. You can test this by getting a pressure tester to isolate the problem.
You can either replace the fuel distributor yourself or take it to a repair service. If you are doing it yourself, you will need to remove the component, take it apart, inspect it, rebuild it with new o-rings, and then reinstall it.
You can buy a replacement fuel distributor from Mercedes-Benz or on eBay.
