Sylvie Willis
The Mercedes-Benz 420SEL is a luxury car produced in the late 1980s and early 1990s. It is known for its powerful engine and smooth ride, but some owners have experienced issues with the fuel distributor, which can cause hard starting and stalling. This guide will cover how to rebuild or replace the fuel distributor on a 1989 420SEL, including steps for removing fuel lines, cleaning and replacing parts, and reconnecting the system.
How to replace fuel distributor rebuild Mercedes 89 420SEL
| Characteristics | Values |
|---|---|
| First steps | Remove gas cap and pull fuel pump relay |
| Crank engine over for 10 seconds to remove pressure from lines under the hood | |
| Disconnect battery | |
| Distributor mechanism | Replace o-ring |
| Mark relative position of distributor and rotor | |
| Fuel supply and return lines | Remove from the fuel distributor and fuel pressure regulator |
| Vacuum line | Remove from the rear of the fuel pressure regulator |
| Be careful to remove only the hard light from the rubber fitting | |
| Do not pull the rubber fitting from the FPR itself | |
| Hard fuel lines | Remove from the top of the fuel distributor |
| Be careful not to twist or kink the lines | |
| Seals | Change |
| Diaphragm | Finish the career at the fuel distributor |
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What You'll Learn
Removing the fuel supply and return lines from the fuel distributor and fuel pressure regulator
To remove the fuel supply and return lines from the fuel distributor and fuel pressure regulator, you must first release the fuel pressure from the system. Remove the gas cap and pull the fuel pump relay. Then crank the engine over for 10 seconds. This should remove most of the pressure from any lines under the hood to reduce gas spillage later.
Next, remove the hard fuel lines from the top of the fuel distributor. Be careful not to twist or kink the lines. You may want to squirt them with penetrant well ahead of time.
Then, remove the vacuum line from the rear of the fuel pressure regulator. Be careful to remove only the hard light from the rubber fitting. Do not pull the rubber fitting from the FPR itself.
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Removing the vacuum line from the rear of the fuel pressure regulator
To remove the vacuum line from the rear of the fuel pressure regulator, you must first remove the gas cap and pull the fuel pump relay. Then, crank the engine over for 10 seconds to remove pressure from any lines under the hood to reduce gas spillage.
Next, remove the fuel supply and return lines from the fuel distributor and fuel pressure regulator. You can bend the hoses out of the way over by the ABS unit and put finger cutoffs from rubber gloves over the ends.
Now, remove the vacuum line from the rear of the fuel pressure regulator. Be careful to remove only the hard light from the rubber fitting. Do not pull the rubber fitting from the FPR itself.
It is important to note that you should be careful when removing the hard fuel lines from the top of the fuel distributor to avoid twisting or kinking them.
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Disconnecting the battery
To disconnect the battery, first remove the gas cap and pull the fuel pump relay. Then, crank the engine over for 10 seconds. This will help to remove most of the pressure from any lines under the hood, reducing the risk of gas spillage.
Next, locate the battery and battery tray. Disconnect the battery, being mindful of any dirt or rust that may be present under the tray. Clean and repaint the area if necessary.
By following these steps, you can safely disconnect the battery and continue with the rebuild process.
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Cleaning the parts and changing the seals
To clean the parts and change the seals of a 420SEL Mercedes-Benz, you should first remove the fuel supply and return lines from the fuel distributor and fuel pressure regulator. You can do this by bending the hoses out of the way over by the ABS unit and putting finger cutoffs from rubber gloves over the ends. Be careful to only remove the hard lines from the rubber fitting and not the fitting itself.
Next, remove the vacuum line from the rear of the fuel pressure regulator. Again, be careful to only remove the hard line from the rubber fitting.
Now you can clean the parts and change the seals. It's a good idea to replace the o-ring.
Finally, drain and remove the radiator. Don't forget the transmission cooling lines.
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Checking all vacuum hoses
Once the vacuum hoses have been removed, they can be inspected for any signs of damage or wear. This may include cracks, leaks, or kinks in the hoses. If any issues are found, it is recommended to replace the vacuum hoses with new ones to ensure optimal performance and prevent future problems.
Additionally, it is important to check for the presence of crush washers at the distributor. Some models of the Mercedes 89 420SEL may have copper crush washers, while others may not. If the hard fuel lines do not have crush washers, it is important to take extra care during removal to prevent twisting or kinking, which can cause damage.
To further ensure the proper functioning of the vacuum hoses, it is recommended to clean the hoses and fittings before reinstalling them. This can be done using a suitable cleaning agent and a brush to remove any built-up dirt or debris. Once the hoses are clean and dry, they can be carefully reattached, ensuring a secure connection to prevent leaks.
By following these steps and paying close attention to the condition of the vacuum hoses, you can help ensure the proper functioning of the fuel system and improve the overall performance of your Mercedes 89 420SEL.
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Frequently asked questions
The first thing to do is remove the hard fuel lines from the top of the fuel distributor. You should also remove the ends from the injectors, and be careful not to twist or kink them.
Remove the gas cap and pull the fuel pump relay. Then crank the engine over for 10 seconds to remove pressure from any lines under the hood and reduce gas spillage.
Remove the fuel supply and return lines from the fuel distributor and fuel pressure regulator. You may get a little bit of fuel spillage but not much.
Be sure to clean the parts and change the seals.
