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#1
07-26-2011, 11:16 AM
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Fuel Filters Service Interval??
I looked in my owner's manual and don't see the service interval for the fuel filters. How many miles before replacing them?
I just changed the two filters on my 300 SDL and 3 things immediately improved. When coasting to a stop, sometimes the engine would stall from low RPMs. Feathering the throttle while braking was the workaround to prevent stalling. Now the RPMs stay up enough to not stall at traffic lights. The car now starts a few seconds faster. Because the car starts faster, the climate control glitch seems to have gone away. When cranking, the system voltage drops. If the CC fan tries to come on when the voltage is low, it fails to start, and it won't start blowing until the key is switched off and the power to the climate control is restored. I've had some frigid winter and hot summer drives because of that glitch. Sometimes I would switch the car off and on again while at speed on the freeway. That would recycle the climate controls so the fan would start blowing. So if you haven't changed your fuel filters in a long while and have any of those 3 problems, it may be time to change the filters.
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. 1st MBz: 1982 300SD 2nd MBz: 1987 300SDL 3rd MBz: 1995 S420 4th MBz: 1987 190DT 5th MBz: 1984 300SD w/1983 300DT engine 6th MBz: 1999 C230k I'm 3rd owner, got it w/57,235 miles. and manages Mom's 2007 R320 CDI 
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#2
07-26-2011, 11:25 AM
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#3
07-26-2011, 12:11 PM
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I agree with the above but tend to change my Spin-on Fuel Filter every 1 or 2 years regardless if it is restricted or not. On my Diesel Volvo I have gone as long as 4 years without changing the Filter as it has a Drain and you can drain off Water and some of the heavier crap that settle to the bottom. People set up their own schedule. You have to decide if you want to try to prevent the Filter from getting restricted by changing it early or changing it only when it needs to be changed. I buy about 98% of my Fuel from the same place and never have had any of my Filters get restricted; let alone plugged enough that I have noticed it. But, as said previously that can change with one bad load of contaminated Fuel.
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84 300D, 82 Volvo 244Gl Diesel
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#4
07-26-2011, 02:12 PM
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I have also cut open a few 20k mile filters and found them to look like new. That's why I just wait for "indications."
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#5
07-26-2011, 02:26 PM
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I have a gauge on my fuel system to tell me when to change filters. Why change it before it's used up? Filters actually do a better job at removing smaller particles as the miles pile on.
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85 300D turbo pristine w 157k when purchased 161K now 83 300 D turbo 297K runs great. SOLD! 83 240D 4 spd manual- parted out then junked
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#6
07-26-2011, 02:39 PM
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Gauge?
Quote:
I generally change both fuel filters once a year unless, as Tango says, there are "indications." Then again, the two cars get driven only about 7500 miles/year. I've also been fortunate to not have massive amounts of fuel tank crud loosened by switching to biodiesel and also to not have had a bad experience on the road. Someday I shall, I suppose, so I also carry spare filters in each car. Edit: "Maintenance Manual USA / Passenger Cars" (Volume 2, Supplement 6, September 1985) lists fuel filter changes as "additional maintenance" items to be done every 30,000 miles. Jeremy
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 "Buster" in the '95 Our all-Diesel family 1996 E300D (W210) . .338,000 miles Wife's car 2005 E320 CDI . . 113,000 miles My car Santa Rosa population 176,762 (2022) Total. . . . . . . . . . . . 627,762 "Oh lord won't you buy me a Mercedes Benz." -- Janis Joplin, October 1, 1970 Last edited by Jeremy5848; 07-26-2011 at 02:49 PM.
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#7
07-26-2011, 03:24 PM
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I miss my diesel wagon. I think I knew when mine was due for a change.
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" We have nothing to fear but the main stream media itself . . . ."- Adapted from Franklin D Roosevelt for the 21st century  OBK #55 1998 Lincoln Continental - Sold Max 1984 300TD 285,000 miles - Sold The Dee8gonator 1987 560SEC 196,000 miles - Sold Orgasmatron - 2006 CLS500 90,000 miles 2002 C320 Wagon 122,000 miles 2016 AMG GTS 12,000 miles
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#9
07-26-2011, 03:44 PM
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Filter Minder (s)
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'84 300SD sold 124.128
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#10
07-26-2011, 03:49 PM
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I swap my canister filter every fall on principle....and the pre-filter as needed because its easily visible for condition.
Overkill, maybe. But I won't have a clogged filter on the coldest day of the year..miles from home...in a snow or ice storm.
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Proud owner of .... 1971 280SE W108 1979 300SD W116 1983 300D W123 1975 Ironhead Sportster chopper 1987 GMC 3/4 ton 4X4 Diesel 1989 Honda Civic (Heavily modified) --------------------- Section 609 MVAC Certified --------------------- "He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche
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