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Old 08-22-2003, 10:30 AM
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Does my diesel have a fuel water separator?

I just purchased my second MB. A pristine 1980 300D. Everything is great other than a shudder form the engine when it starts in the morning or after sitting a few hours. I had the valves adjusted and it still shudders until the temp goes to 40 C. I noticed under the hood on the drivers side a canister with a drain on the bottom, a filter inside, and a air valve on top. It has two fuel hoses that have been cut leaving it unattached. Did this come with my car originally, or is it an add on? My service manual doesn't mention it. Could this be the cause of my shudder?

thanks again,
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Old 08-22-2003, 11:02 AM
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This is an aftermarket fuel filter/separator. It was probably disconnected because it leaked or got plugged up.

The factory prefilter and main filter will do a totally adequate job, so enjoy your car and be happy.

Have a great day,
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Old 08-22-2003, 11:17 AM
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About the shudder, I lookesd the owners manual and it says on a cold start to turn the idle adjustment Knob CCW until the idle smooths. Is this necessary on every cold start? Engine idles smoothly when I do this.

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Old 08-22-2003, 05:10 PM
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Join Date: Jan 2002
Location: Knotts Island, NC
Posts: 382

Turn the idle knob CCW on prior to all cold starts. idle will be smoother and easier on the engine and tranny mounts.

1982 240D 313,000 (4 speed)
1984 300CD 172,483
1985 German Shepherd Dog -Lacey- R.I.P.11/04/05

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