Question about 1984 Mercedes-Benz Mercedes Benz 300 Class

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I need a diagram showing fuel filter placement

1980 Mercedes 300 SD. Show me diagram on how to change out fuel filters, so i can do it. i already have filters

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A warning ahead of time: you WILL get dirty doing this, so don't wear nice clothes. the fuel filters are both on the left side of the engine. you'll need an adjustable wrench which goes above an inch, and a philips screwdriver. For the small filter, find the hard brass lines coming out of the left side of the engine, and follow them down to the injection pump. at the front of the pump, there should be a few inches of soft rubber line attached to a small, clear plastic filter that looks like the one in the small box you've got. undo the screws on the clamps on both sides of that filter, and gently twist the rubber fuel line back and forth, while pulling them off the filter. When you do this, fuel will go everywhere, but make sure that the line that comes from the back of the engine bay is lifted up, this will keep the spilling down, because this line goes straight to the fuel tank, and will just keep running, as long as it's pointed down. I like to cover it with my thumb, but others do it in other ways. Grab the new filter, and find the arrow molded into the outside of it. Make sure this arrow is pointed to the fuel line which goes to the injection pump. Wiggle the new lines on, tighten the clamps (enough that they compress the rubber, but you don't have to go nuts), and that's the first part. for the big one, get your wrench out, and find the big filter at the top-front of the engine (it looks like a spin on oil filter, and should have large brass lines and one small, black, flexible, braided line going into the top. Undo that nut on top until the filter below comes free. You'll know when this happens because A) fuel will be running out of it and B) the filter itself will start spinning when you turn the bolt. At this point, hold the wrench still, on the bolt on top, and unscrew the filter (clockwise from the top). Pull your new filter out of the box, and fill it with diesel, then take your finger, dip it in the fuel, and run it around the gasket on top of the new filter. Now start the filter back on, by turning it while holding the bolt still, and spin it up until it's tight, then use the wrench to tighten it the rest of the way (again, tight, but you don't need to be the Incredible Hulk to tighten it). You shouldn't need to prime it, but there is a black knob on the front of the pump, just push it 3-4 times and you should be set. It could be a little hard to start at first, but once the air's out of the system, you'll be good as new.

Posted on May 30, 2009

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Try "autozone.com" or your local library for diagrams or step by step instructions

Posted on Mar 08, 2009

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