76 300D No Power? - Mercedes-Benz Forum

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post #1 of 6 (permalink) Old 06-28-2015, 02:46 AM Thread Starter
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76 300D No Power?

OK so my 76 300D w115 is loosing power.. I checked the valves and there is no problem there. Removed air filter, still no change..
Basically what its doing is; decent acceleration from stop. But not as much as it had when I first got it. Then even on flat ground it will not get over 50-60mph. Also it takes a while to get to that speed. And it feels almost as if at that speed its running out of gas. Starts to loose power and regains just enough to keep it going at 50. And don't even gete started on hills.. A moderate hill I can get up to 30mph maybe. But on my way home there is a rather steep long hill, I quickly slowed to 15mph and crawled up it in first gear. It would not go any faster. And I thought for sure it was going to stop all together lol.

My guess is there must be some type of fuel filter problem maybe? Where should I start?
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post #2 of 6 (permalink) Old 06-28-2015, 04:31 AM
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How about you start with the fuel filter, like you yourself suggested?
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post #3 of 6 (permalink) Old 06-29-2015, 11:10 AM
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Certainly sounds like a fuel delivery problem. After the fuel filter, I'd think about the screen in the gas tank, because it is easy to get to. Then look for dirty fuel injectors (been there), and the injector pump itself. There is a mechanical governor on the rear... The diaphragm in the pump is operated by a cam on an axle that protrudes out the housing. Mine had to C-clip to hold it. What a difference that made! I got that from an excellent thread:

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post #4 of 6 (permalink) Old 07-06-2015, 06:53 AM
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Also check throttle linkages, adjust & lube, bushings?

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post #5 of 6 (permalink) Old 07-10-2015, 10:53 AM
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There are two fuel filters and the screen in the tank.
The screen in the tank can be replaced from underneath the car forward of the rear suspension.
If it hasnt been serviced recently, I would replace the entire screen assembly and the hose with fitting.
You must consider flushing out the tank or run the risk of the screen clogging again.
Replacement of the in line and spin on filter is a good idea as well.
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post #6 of 6 (permalink) Old 07-10-2015, 12:36 PM
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PLEASE update your profile! year and type of car. Location in the world as well. We don't like to scroll up 9 replies to check year and type of car once you reply.

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