Vadim Pusca

Hi guys im new to this forum but i got to ask you all a question. Im not the kind of guy who has 2 left hands i know my way around cars, but this problem that i currently have got me. Maybe you guys can shed some light. OK so i have a 2005 Mercedes C 240, 6 Cyl. and recently its been consuming gas like its nobody's business. For a full tank of gas i go about 220 miles which i personally believe its crap, i dont believe there is another car on this planet that consumes that much gas. Any suggestions on what me be wrong? I changed the gasoline filter. Engine filters are new. Could it be the gasoline pump? Any suggestions are greatly appreciated.

Thanks

MJ50

moved to W203 forum...
when was fuel filter changed?

samaritrey

Need more info such as how old car is what maintenance have you done ect
What type of driving are you doing when you get 200 miles of range.

Moviela

Did you use an OEM gas filter? There have been lots of problems with the pressure regulator in non-OEM filter assemblies. You can easily measure the pressure in the fuel rail to determine if correct pressure is there.

How are your plugs? There are twelve of them, and their condition is critical to good performance. How are the wires? Clean and nice? No carbon tracks?

How are the four hoses that connect from the valve covers to the throttle body? They should be brittle by now, but are cheap to replace with soft supple new ones.

How are your valve cover gaskets? Vacuum leaks anywhere? These will kill mileage. How is your MAF and temperature sensors? Is the OBDII system throwing any codes?

Use an OBDII reader to observe fuel trims. Do they make sense or are they way too rich?

You should diagnose the problem before spending any money on parts. Have a pro check it with a star system. Costs less than throwing parts at it.