The third fuel filter. Where is it? - Mercedes-Benz Forum

 
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post #1 of 8 (permalink) Old 10-13-2016, 08:17 AM Thread Starter
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The third fuel filter. Where is it?

Thank you in advance for the help. I have a 76 300d and am looking for the third filter. I have changed the inline and screw on under the hood. Where is the third one at?
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post #2 of 8 (permalink) Old 10-13-2016, 08:32 AM
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it is in the tank. I believe it is in the middle and removed from under tank it takes an allen wrench to remove

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post #3 of 8 (permalink) Old 10-14-2016, 07:20 AM
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Either a 16 or a 20mm one, yes. I can never remember which. When you take this out, you'll see a fine mesh most likely clogged after use of crud. My recommendation is to clean it with some acetone (nail polish remover) and put it back in.

And be sure that the tank is empty before removing it, or you'll spill fuel until it is
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post #4 of 8 (permalink) Old 10-14-2016, 10:42 AM
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I use an inverted spark plug socket to remove them. They are quite tight. I've had to use a 3' "cheater bar" and a pipe wrench before.
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post #5 of 8 (permalink) Old 10-14-2016, 02:14 PM Thread Starter
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Maybe this isn't for this car.

When I bought the car, it came with two of these from the original owner. Have always changed the oil, inline and screw on filters at the same time. And the tank yearly. Just wanted to be sure I wasn't missing out on something important.
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post #6 of 8 (permalink) Old 10-14-2016, 08:00 PM
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The "in-line" filter is actually a baffle.Yes, it does stop large chunks of crap but its primary purpose is to smooth the surging of the fuel supply.

I know, I know, 400 people are going to argue this point but it is true. You would not want a filter before the lift pump because if it clogged the system would run dry. Not a good thing to happen to a diesel injection system. If you are getting particles in the baffle then you have a problem with the fuel tank system. Drain, clean the tank and use fresh fuel. Or you can use a flushing agent and keep replacing filters. Your money and your time, I'm a lazy S.O.B., I only like to fix things once.

Whatever the filter in the picture is, it is NOT the fuel filter for your car. You've got the part number on the box. Do a search.


Listed as a "pre-filter"

The third fuel filter. Where is it?-0014774201-m45.jpg
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Last edited by Mike D; 10-14-2016 at 08:14 PM.
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post #7 of 8 (permalink) Old 10-14-2016, 08:06 PM
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Fuel Filter Kit for a 1976 300D

Part #: 000-470-01-92-67-M45


I might be wrong about the separate supplied filter. It might be a good number.
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Last edited by Mike D; 10-14-2016 at 08:10 PM.
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post #8 of 8 (permalink) Old 10-18-2016, 12:33 PM Thread Starter
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Thank you Mike!
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