Reviving a classic Mercedes-benz R129 after a long period of inactivity often brings about unique challenges, particularly within the fuel system. If your R129 has been sitting idle, addressing the fuel tank, especially the strainer and outlet hose, might become necessary. Owners frequently encounter situations where old fuel leads to blockages or corrosion, hindering the revival process. While complete fuel tank removal on an R129 isn’t a routine procedure, understanding the process can be invaluable, especially when dealing with potential blockages in the fuel strainer or a deteriorated outlet hose. This guide addresses common questions and provides insights into the fuel tank removal process for your Mercedes-Benz R129, aiming to offer clarity and direction when tackling this intricate task.
Addressing R129 Fuel Tank Removal Queries
Many Mercedes-Benz R129 owners contemplating fuel tank maintenance or removal often share similar concerns, particularly regarding the accessibility of components like the fuel strainer and outlet hose. Let’s delve into some frequently asked questions to shed light on these concerns.
1. Can the R129 Fuel Tank Be Removed with the Strainer and Outlet Hose Still Attached?
This is a common question, especially when access to the strainer and outlet hose from underneath the vehicle appears challenging. The short answer is, potentially, yes, with some caveats.
- Feasibility of Removal: It’s conceivable to remove the R129 fuel tank without first detaching the strainer and outlet hose. This approach hinges on whether there’s sufficient clearance and flexibility to maneuver the tank out of its position while these components remain connected.
- Cutting the Outlet Hose: If space is a constraint, carefully cutting the rubber outlet hose might be necessary to facilitate tank removal. This would be a strategic cut, allowing the tank to be extracted and providing better access to the strainer. Remember, if you opt to cut the hose, you will definitely need a replacement hose for reinstallation.
- Access Considerations: Attempting to remove the strainer and outlet hose while the tank is still in place can indeed be awkward due to limited space and potential corrosion making fasteners difficult to loosen. Removing the tank first can offer significantly improved access for dealing with these parts on a workbench, where you have better leverage and visibility.
- Risk Assessment: While removing the tank with these parts attached might seem quicker, consider the potential risks. Forcing components could damage the tank or connected lines. Careful assessment of your specific situation, including the condition of the hose and strainer connections, is crucial before proceeding.
2. What are the Key Steps and Disconnections Required for R129 Fuel Tank Removal?
Removing the fuel tank from a Mercedes-Benz R129 requires a systematic approach, involving several key steps and disconnections. While not an exhaustive step-by-step manual, here are the essential areas to address:
- Rear Firewall Removal: Accessing the fuel tank necessitates removing the rear firewall panel located behind the seats. This panel typically provides access to the top of the fuel tank and related connections.
- Filler Neck Disconnection: The fuel filler neck must be disconnected from the tank. This usually involves loosening clamps and carefully detaching the filler neck hose from the tank. Pay attention to any smaller vent lines connected in this area as well.
- Sender Wire and Electrical Connections: Locate and disconnect the fuel sender wire and any other electrical connections linked to the fuel tank. These are often accessible once the rear firewall is removed. It’s advisable to disconnect the battery before working on any electrical components of the fuel system to prevent shorts or sparks.
- Fuel Lines and Hoses: In addition to the outlet hose, identify and disconnect any other fuel lines connected to the tank. This might include fuel supply and return lines. Ensure you have properly depressurized the fuel system before disconnecting any lines to minimize fuel spillage and pressure hazards. It’s good practice to have appropriate plugs or caps ready to seal off open fuel lines once disconnected.
- Tank Straps or Mounts: Identify and unbolt or unfasten the straps or mounts that secure the fuel tank to the vehicle’s underbody. These are typically located underneath the car and support the tank’s weight. Ensure you have a safe way to support the tank as you release these mountings to prevent it from dropping unexpectedly. A transmission jack or sturdy jack stands can be useful for controlled lowering of the tank.
- Vent Lines and Overflow Hoses: Check for and disconnect any vent lines or overflow hoses that may be attached to the fuel tank. These are often smaller diameter hoses and play a role in the fuel system’s venting and emissions control.
Important Considerations:
- Safety First: Fuel systems contain flammable and potentially hazardous vapors. Work in a well-ventilated area, avoid open flames or sparks, and have a fire extinguisher readily available. Wear appropriate safety gear, including eye protection and gloves.
- Fuel Spillage: Despite draining the tank, some residual fuel spillage is likely. Be prepared to catch any spilled fuel and dispose of it properly according to local regulations. Rags and drip pans are essential.
- Documentation: Take photos as you disassemble components. This can be invaluable during reassembly to ensure everything is correctly reconnected.
- Professional Assistance: If you are uncomfortable or lack experience working on fuel systems, it’s always wise to seek assistance from a qualified Mercedes-Benz technician. Fuel system work requires precision and attention to detail for safety and proper vehicle operation.
Conclusion: Approaching R129 Fuel Tank Tasks with Informed Strategy
Dealing with fuel system issues on a classic Mercedes-Benz R129, such as accessing the fuel strainer or outlet hose, might necessitate fuel tank removal. Understanding the potential for removing the tank with certain components still attached and knowing the essential steps for tank removal empowers you to approach this task with greater confidence. Remember to prioritize safety, meticulousness, and seek professional help when needed to ensure the successful revival and longevity of your cherished R129.
