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Old 01-31-2009, 08:20 PM
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Red face What is the Fuel Pump Location of 1981 Mercedes-Benz 300SD Diesel?

Hello to Anyone that Knows,
I'm hoping someone can help us - my son and friend on working on their 1981 Mercedes Benz 300SD diesel that had the fuel pump go out. After several months of saving money, one was purchased at a junk yard (already removed from the wrecked vehicle). However, they are out there in the drive first taking off the fuel tank, then someone said it was under the hood. Can anyone give me a more exact location and maybe an image of what they're looking for? Any other pointers would be great too.
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Old 01-31-2009, 08:53 PM
Join Date: May 2002
Location: Blue Point, NY
Posts: 25,396
Welcome to the forum.

The fuel pump is under the hood on the driver's side. You'll need to find the injection pump which is the device next to the engine on the driver's side with five metal tubes sticking out the top.

On the side of this device facing the left side of the vehicle and down the fuel pump. Follow the fuel line and you cannot miss it.

All that being said, however, why do you believe that the fuel pump "went out"? It's fairly common to diagnose a bad fuel pump on a diesel that won't start, when, in reality, that is not the cause.
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Old 02-01-2009, 11:22 AM
NC Benz's Avatar
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Join Date: May 2007
Location: Fuquay-Varina, NC
Posts: 485
Agreed. Thought I lost my fuel pump. It turned out to be air in the injector lines.
NC Benz
Fuquay-Varina, NC
1979 300D
1983 300D Turbo 260,000 Miles
1984 300D Turbo 345,000 Miles (sons car)
OBK #31
1998 Ford Expedition 5.4l (fer Haulin'!) 145,000
1973 19' SeaRay with 115 Mercury TOWER OF POWER!
Club Car Golf Cart 36V
Ex toys:
1967 Mustang 289 (First Car)
Fiat 124TC
1975 Honda CVCC
1980 Audi 5000 Turbo
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Old 02-01-2009, 02:33 PM
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Location: Long Beach,CA
Posts: 23,341
I would slow your Son down and have him spend some time reading up on the job before attempting to install the replacement Fuel Injection Pump followed by timing it. Even people with a high degree of mechanical skill can have some trouble with the above.

It also leads to the question how did someone diagnose that the Fuel Injection Pump was the problem when they do not even know where the Fuel Injection Pump goes?

I am not trying to be negative just practical.

Also the Fuel Supply Pump (this is the pump the pulls the fuel From the Fuel Tank and pushes it through the Spin On filter and into the Fuel Injection Pump) is mounted on the side of the Fuel Injection Pump.
84 300D, 82 Volvo 244Gl Diesel
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Old 02-01-2009, 02:36 PM
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Join Date: Dec 2005
Posts: 417
Lift pump or injection pump? That is the question.
1981 300TD - daily driver
1963 Chevy II
2001 F-250 7.3 Power Stroke
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Old 02-01-2009, 06:25 PM
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Location: Frederick, Md
Posts: 4,540
or clogged filters...

1980 500SE/AMG Euro
1981 500SEL Euro
1982 380SEL
1983 300TD
1983 500SEC/AMG Euro
1984 500SEC
1984 300TD Euro
1986 190E 2.3-16
1986 190E 2.3
1987 300D
1997 C36 AMG
2003 C320T 4matic

past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350
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Old 02-01-2009, 09:41 PM
Join Date: Dec 2008
Location: St Petersburg, Fl
Posts: 100
If the boys removed the fuel tank, it's time to clean it out and check the strainer, etc.
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Old 02-01-2009, 09:46 PM
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Join Date: Jan 2002
Posts: 18,353
Seems odd that it would take months of saving to afford a fuel pump. It also seems odd that a lift pump already removed from the car couldn't be identified in the engine compartment.
1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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Old 02-02-2009, 02:42 AM
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Join Date: May 2007
Location: Out in the Boonies of Hot, Dry, Dusty, Windy Nevada
Posts: 9,585
First of all, where are you located? maybe there are some forum members that could come by and give the boys some pointers.

If they have to save for a few months for a fuel pump, how on earth are they going to afford to operate it? There is nothing more expensive than an old mercedes.

There is a wealth of information here on the forum to read doing some searches, or just by reading the daily threads.

In the resources tab above, look in the DIY section. has a lot of pictorials on DIY.

This old SD will be a great learning experience for them.

there were three HP ratings on the OM616...

1) Not much power
2) Even less power
3) Not nearly enough power!! 240D w/auto

Anyone that thinks a 240D is slow drives too fast.

80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff

We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works
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