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  #1  
Old 04-27-2003, 06:50 PM
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Join Date: Nov 2002
Location: Los Osos, CA
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How does one replace the fuel filter on a 300e?

Hello All,
I am currently in the process of trying to replace the fuel filter for my 87 300e. I got the filter and got the cover off, but when I went to disconnect the filter it wouldn't budge. I tried to use wrenches to loosen the 17mm fitting that connect the filter to the rubber hose on one side, but to no avail. Am I doing something wrong?
Thanks
Scott
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1987 300e - The 200,000 mile TurboTechnics rocketship.
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  #2  
Old 04-27-2003, 09:26 PM
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Join Date: Dec 2001
Posts: 571
Both sides of the filter have counter nuts attached. You place an open end wrench on the counter nut; then break the fuel line attachment loose. You'd turn the counter nut clockwise and the fuel connection counter-clockwise to loosen.

There are at least 2 washers that need to be replaced when you reconnect. They'll come off when you get the fuel lines apart.

Last edited by Mike Richards; 04-28-2003 at 08:46 PM.
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  #3  
Old 05-07-2003, 06:52 PM
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Location: Los Osos, CA
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Hmm, a can of PB Bolt Blaster did wonders to unlock the nut. Filter came out easy as anything. And to think I almost paid $50 to get it done.
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1987 300e - The 200,000 mile TurboTechnics rocketship.
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  #4  
Old 05-08-2003, 12:03 AM
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How much gas leaked out when you did this? Did you somehow clamp the fuel lines to stop fuel from flowing, or wasn't it necessary? This job is on my "to do" list, so I'd like to hear any pointers.

Thanks,

GregS
'84 300D, 174k
'90 300CE, 163k
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  #5  
Old 05-08-2003, 12:11 AM
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Fuel loss is minimal. I also back the car up on ramps - not all the way, but enough to give some room down underneath and remove the ground strap from the battery before starting(safety issue).

I always thought that clamping a hose was damaging to it. It takes quite a bit of pressure to really shutdown flow, so I just stick a round pencil in the end to stop the flow. In this case, it works fine.
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  #6  
Old 05-08-2003, 12:47 PM
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Location: Saugus, CA USA
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Its when you change the fuel pumps that gas flows
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  #7  
Old 05-08-2003, 04:54 PM
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Location: Austin, TX
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The official MB procedure involves two clamps, one on the hose from the tank to the elbow fitting and the other on the hose from the fuel filter to the fuel line. If your hoses can't handle being clamped, replace the hoses too.
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1988 560SL Black/Palomino
1988 300SEL Black Pearl/Burgandy
1984 500SEC Anthracite Grey/Palomino
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