splinter

Replaced its fuel filter again this morning.
Notwithstanding the fact it’s subjected only to so-called ‘top tier’ fuel from high-volume filling stations,
witnessed a surprising amount of debris in the catch basin upon draining it – after only ~30,000 miles.

Our local dealership quoted “about $300” to perform the simple task.
Figuring $50 street price for the filter and a casual half-hour of labor, it was time well spent.

Note the C32’s filter contains an integral fuel pressure regulator, so it’s probably best to avoid bargain suppliers.

Additional information…https://mbworld.org/forums/c-class-w...placement.html

john0183

I have looked for the fuel filter part and can't seem to find the part at autozone or any parts store . Could you help me out guys is it attached to the fuel pump I am trying to learn , thanks.

C230 Mulac

A couple of the best websites for OEM parts:

www.rmeuropean.com
www.pelicanparts.com
www.autohausaz.com

Check those. Also, try checking the specific forum for your model vehicle, which appears is E500, unless you haven't updated that?

c32used

Sorry to bring out old thread but fuel pressure tested from fuel rail on C32 I was told should run at or around 60 psi when car on and when car off shouldn't go under 50 psi even if off all night.....is this right? I was told culprit usually is fuel filter since they have regulators inside. What else can be a culprit?

vaiste001

Worn out fuel pump can also reduce pressure. I had a pressure reading of 45 psi (3,1 bar) when my pump started malfunctioning. After a new factory filter and Walbro 255 pump my pressure is minimum of 56 psi (3,8 bar) and it stays stable all the way up 280 km/h. I have a meter hooked up inside the cockpit so I can see pressure at all times.

c32used

Thanks for reply...I left gauge tester on last 2 days...yesterday after car being off 24 hours the lowest it got to was 22 psi...whats weird is I started car again it went to 60 psi like always and turn car off 5 minutes later and checked tester about 12 hours later it showed 10 psi. That's 12 hours it went to 10 psi....I turned it again this morning and it went up to 60 psi and turned car off 5 minutes later and I want to say within 5 minutes it was at 10 psi....I don't get how it could hold 22 psi for 24 hours then now it shows 10 psi in less then 5 minutes. It really sounds gas related somehow maybe filter or pump or injector. The code I get is P0303 cylinder 3 misfire. Only thing I haven't done is check the fuel filter, check cylinder 3 cat or injector for cylinder three...I know it isn't major cause car turns on and drives fine if I start to drive before secondary airpump turns off...no codes nor bad behavior rather driving normal or WOT.