marthasteel8

G Klasse Stalling After Fuel Filter Change

My 2018 Mercedes G Klasse with a gasoline engine is giving me headaches. Check engine light is on, it stalls at idle sometimes, and the power is way down. I'm thinking it's the fuel pressure regulator. It all started after I swapped the fuel filter. Could that be it? Rough idle, pressure drop, and even some engine misfire… I'm pulling my hair out over this fuel system!

4 comment(s)

Sounds rough! I had a similar issue with my old BMW 3 series. The symptoms were almost identical – check engine light, rough idle, the whole shebang. Turned out to be a faulty fuel regulator after messing with the fuel lines. Did you make sure everything was properly connected after changing the filter? Maybe a loose connection somewhere?

Yeah, I thought I double-checked everything, but maybe I missed something. Where exactly was the issue on your BMW? Was it obvious, or did you need special tools to find the problem?

Honestly, it wasn't super obvious at first. I ended up taking it to a workshop. They used a fuel pressure tester to pinpoint the pressure drop and engine misfire. The error entry pointed to the fuel regulator in the fuel system. It's probably worth getting yours checked out by someone with the right equipment. Could save you a lot of guesswork!

Ugh, that's what I was afraid of. Thanks for the info! Took it to the workshop as you suggested, and you were spot on. Error entry after changing the fuel filter. Fuel pressure regulator was indeed defective. Replaced it and it only cost me 45€. Runs like a dream now!

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