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Old 09-17-2002, 12:28 AM
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Join Date: Sep 2001
Location: Austin, Tx
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replacing fuel filter on a 300E...

Hey everyone. I am having some trouble with my fuel filter on my 1992 300E. I can get the front connecting screw off easy enough, but I can't seem to budge loose the back nut fastner. I tried to use a cheater tube, but I still could'nt break it loose, and I don't want to break something else in the process. Is there a trick to loosening the fastening nut? Thanks.
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Old 09-17-2002, 02:48 AM
pmizell's Avatar
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Join Date: Jun 2001
Location: Houston, Texas
Posts: 838
That bolt is a b*tch to break loose -- I couldn't do it so I just took out the one in my new filter and left that bolt in place.

Make sure you seal both ends with a new copper washer and tighten them down well.

Good luck
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'01 E430, Sport 72,000 mi
'98 C280, 126,500 mi
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Old 09-17-2002, 02:49 AM
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Join Date: Dec 2001
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Is there a counter-nut affixed to the filter where the line(s) connect? I'm not sure if your vehicle has the M103 or M104 motor - their fuel filters could be similar.

In my case, there's a counter-nut that I can turn CW while I loosen the fuel line connections CCW
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Old 09-17-2002, 08:13 PM
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hmmm, interesting, I have the m103 motor. I will try the counter rotating method. I to have been able to break loose the attachement that connects direcly to the fuel pump, but I thought it was a bad thing, so I twisted it back into place. Thanks for the tips, ill try it this weekend!
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