Experiencing car trouble, especially stalling, can be frustrating. If you’re driving a Mercedes-Benz and suspect fuel delivery issues, the fuel pump is a prime suspect. Before considering replacing the entire Mercedes Benz Fuel Pump, a simpler and often overlooked component is the fuel pump relay. This relay is crucial for powering your fuel pump, and a faulty relay can lead to intermittent or complete fuel pump failure, resulting in stalling and starting problems.
For owners of older Mercedes models like the ’87 560SL, accessing this relay might seem daunting. However, you might be surprised to learn that on some models, accessing the fuel pump relay is surprisingly straightforward, often without needing to dismantle the dashboard. This guide will walk you through a simple method to access and potentially replace your Mercedes Benz fuel pump relay, drawing on the experience of a fellow Mercedes enthusiast.
One common symptom of a failing fuel pump relay is engine stalling, particularly when turning or under load. This can happen because a failing relay might momentarily interrupt power to the Mercedes Benz fuel pump, causing fuel starvation. While diagnosing car issues can be complex, starting with easily accessible and affordable parts like the fuel filter and fuel pump relay is a smart approach.
For the ’87 560SL, and possibly other similar models, the fuel pump relay can be accessed through the glove box. Here’s how:
- Locate the Glove Box Access Panel: Begin by emptying your glove box. Look for a small, rectangular access panel, often around 5 inches diagonally, on the upper side within the glove box.
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Remove the Access Panel: Carefully remove this panel. It might be held in place by clips or screws. Removing this panel will reveal the area where the relays are located.
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Gain Clearer Access (Optional): For easier access, some models might have a lower panel beneath the glove box that can be removed. Additionally, if there’s an HVAC conduit obstructing your access, gently removing it (as shown in the original post) can provide significantly more room to work.
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- Identify and Replace the Fuel Pump Relay: Once you have access, you’ll see several relays. The fuel pump relay is typically one of these. It’s helpful to consult your Mercedes-Benz owner’s manual or a wiring diagram to pinpoint the exact location of the fuel pump relay. Before removing any relays, take a picture or note their orientation to ensure correct reinstallation.
Mercedes Benz Fuel Pump Relay Location and Removal
- Test and Replace: Carefully pull out the fuel pump relay and inspect it for any signs of damage. You can try replacing it with a new relay. Ensure you are using the correct type of relay for your Mercedes Benz fuel pump system.
While this guide focuses on accessing the relay through the glove box on a specific Mercedes model, the principle of checking the fuel pump relay remains relevant for many Mercedes-Benz vehicles experiencing fuel delivery problems. If you’re encountering stalling or suspect issues with your Mercedes Benz fuel pump, investigating the fuel pump relay is a worthwhile step before moving on to more complex and expensive components like the fuel pump itself. Remember, always consult your vehicle’s service manual for specific instructions and safety precautions. If you’re uncomfortable working on your car, it’s always best to consult a qualified Mercedes-Benz mechanic.
