benjaminloewe85

Mercedes G Klasse Diesel Fuel Pump Issue

My 2003 Mercedes G Klasse with a diesel engine is acting up. It has around 280085 km on it and sometimes won't start, stalls when idling, the check engine light is on, the engine runs rough, and my fuel consumption has increased. I scanned it and it throws a fuel pump error. Could it just be a dodgy cable or plug connection? I'm hoping it's not the whole fuel injector or fuel system needing replacement. I am really worried about car performance and gasoline delivery. What do you think?

A 2003 Mercedes G Klasse with a diesel engine was experiencing starting issues, stalling, rough idling, a check engine light, and increased fuel consumption, with a diagnostic scan indicating a fuel pump error. The problem was suspected to be a faulty cable or plug connection rather than a complete fuel system failure. Upon inspection by a mechanic, a corroded connection to the fuel pump was identified and cleaned, resolving the issue and restoring the car's performance.

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4 comment(s)

That sounds awful. Is it possible that your fuel system is compromised? I once had similar symptoms with my old Opel Corsa—rough idling, stalling—turned out to be a bad connection to the fuel pump relay. Have you checked that?

A bad connection to the fuel pump relay, huh? Now that's something I haven't checked. Where exactly would I find that? And how did you diagnose it on your Opel Corsa? Was it a simple visual inspection, or did you need special tools?

Well, in my case, the mechanic found it. I think he used a multimeter to check for continuity. Honestly, I'd suggest taking it to a workshop; they can pinpoint the problem quickly. It might save you money in the long run. It does sound as if you have a fuel system issue!

Thanks for the advice! So, turns out you were right; the mechanic checked the cable and plug connection to the fuel pump. It was corroded! They cleaned it up, and the error vanished. Cost me 95€, which I'm pretty happy about. Car's running great again. I was expecting a huge auto repair bill. Really appreciate the tip!

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MERCEDES

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GKLASSE