Mercedes Benz SL500 Fuel Pump
Four Trouble Signs of a Failing Mercedes Benz SL500 Fuel Pump
It's kind of funny when you realize that a car as advanced and luxurious as a Mercedes Benz SL500 can be rendered non-functional by a part as simple and as humble as a fuel pump. It's true, though, without the fuel pump to shunt valuable fuel to your engine, you might as well have owned an overpriced lawn ornament. Most people don't realize it but it's actually easy to spot a fuel pump that's close to failing. All you have to do is watch out for these four symptoms, and you will always be fore-warned.
One thing you will notice when your pump has failed or is in the process of failing is that, after a few miles of normal driving, the SL500 starts to sputter. It's critical that, if you are using this as a test, to let the engine idle for twenty minutes or so-sometimes overheating can be the cause in older vehicles. If it happens to a relatively new one, however, the fuel pump is likely at fault.
You have to be very attentive with this symptom because it only occurs when the engine is first engaged. The sound will be terribly annoying and loud. This results from the engine being starved of fuel in the case of a malfunctioning fuel pump.
If, from the get go, your vehicle doesn't want to start, and you've eliminated the chance of it being caused by the battery and ignition, then the fuel pump is the logical culprit responsible for the failure. That's because fuel-coupled with electrical discharge-are essential for starting and acceleration. Without a working fuel pump, no fuel gets shunted to the engine.
Misfiring at normal speeds
Again, this is due to the lack of fuel in the engine due to the inability of the fuel pump to deliver. This is one of the more dangerous of the symptoms, and can potentially cause a very nasty accident. If you manage to observe all symptoms given and still reach this point, then the problem with the fuel pump is a lot more serious than what you imagine.
What to do?
It's actually better to replace the entire fuel pump rather that attempt repairs that leave the entire pump vulnerable and much less durable.