1971 250 Fuel Pump Question - Mercedes-Benz Forum

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post #1 of 14 (permalink) Old 08-04-2015, 11:04 AM Thread Starter
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1971 250 Fuel Pump Question

Hi All,
I've been away awhile, but still making small gains with my W114. The car had been running well the past couple of months, after it left me stranded for an hour a couple of months ago. Well, Saturday before last the car decided to die and not restart. I had it flat bedded home and of course it fired right up once in my driveway. I finally decided to install the new fuel strainer that I'd bought 2 months ago and I moved the fuel filter to the carburetor side of the fuel pump from the inlet side. Now for my question, I suspect my fuel pump may be getting weak so I want to replace it. The problem is, I have the style that has a 90 degree shaft on it and all the online vendors sell a different style. Can anyone tell me what the difference is and where I can get the correct part? Even the EPC shows the part number for the straight shaft model, which Fonzi was kind enough to give me, but it doesn't match the one on my car. Any help/advice is welcome.
Dan
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post #2 of 14 (permalink) Old 08-04-2015, 12:23 PM
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Vin: 114.011.12.003097

Picture of Dan's current pump:
1971 250 Fuel Pump Question-imageuploadedbyautoguide1438712184.964273.jpg

EPC part number: 115.090.01.50

AutohausAZ part number for 1971 250: 115.090.01.50

Picture of autohausaz pumps:
Name:  ImageUploadedByAutoGuide1438712481.332138.jpg
Views: 106
Size:  59.2 KB
Name:  ImageUploadedByAutoGuide1438712490.080516.jpg
Views: 121
Size:  45.9 KB

Picture of "new" pump in a vaico that had 115.090.01.50 part number on it that I found in trunk of my 1971 250 and gave to Dan:
1971 250 Fuel Pump Question-imageuploadedbyautoguide1438712243.530551.jpg

Picture of pump Dan found by googling w114 fuel pump:
Name:  ImageUploadedByAutoGuide1438712547.847246.jpg
Views: 169
Size:  50.3 KB


I think Dan's question is where to find the fuel pump in the last picture, and what it's part number should be.

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post #3 of 14 (permalink) Old 08-04-2015, 12:30 PM
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Apparently not a place to buy, but I have yet to find where the WorldPack picture came from. If you can give that part number to your mechanic, he can surely order from WorldPac

http://fautoparts.com/body-Fuel-Pump...3.0-auto-parts

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post #4 of 14 (permalink) Old 08-04-2015, 02:38 PM Thread Starter
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Thanks Fonzi. I think WorldPac is owned by Advance Auto Parts now. Maybe it's the other way around.
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post #5 of 14 (permalink) Old 08-04-2015, 03:00 PM
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1971 250 Fuel Pump Question

Ask Sam if you need a Pierburg.

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post #6 of 14 (permalink) Old 08-08-2015, 06:14 AM Thread Starter
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Now I have fuel pouring out of the vent on top of the rear carburetor. I've pulled the top two pieces off the carburetor so I can check the float adjustment. Hopefully that will fix the problem.
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post #7 of 14 (permalink) Old 08-08-2015, 07:23 AM
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That style pump is nla. It either works or it doesn't, there is no in between. I found vendor on ebay that sold repair kits, that worked with modifications. You only need if the diaphragm breaks.
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post #8 of 14 (permalink) Old 08-08-2015, 07:26 AM
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Quote:
Originally Posted by dgosh28 View Post
Now I have fuel pouring out of the vent on top of the rear carburetor. I've pulled the top two pieces off the carburetor so I can check the float adjustment. Hopefully that will fix the problem.

The float valve must not be working or the float is sticking. The valve is part of a repair kit, and probably should have been replaced with the rebuild on your carbs. Taking a look at your spare carbs on the shelf might help you understand what's going on.

It might also be worth checking the fuel return valve on the front carb to make sure it's allowing fuel back to the tank.

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post #9 of 14 (permalink) Old 08-08-2015, 07:43 AM
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Quote:
Originally Posted by rumb View Post
That style pump is nla. It either works or it doesn't, there is no in between. I found vendor on ebay that sold repair kits, that worked with modifications. You only need if the diaphragm breaks.

Dan,
This may be the answer to the query of whether your pump is a problem. It sounds like your pump probably isn't a problem. Maybe replacing the fuel tank screen and putting the filter on the carb side of the pump will solve your problems... at least until some bits of rust get into a tube in the fuel tank. Keep the tank full when venturing away from home in case there are some tubes on the bottom of your tank that are clogging.

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post #10 of 14 (permalink) Old 08-08-2015, 07:55 AM
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re: piersburg fuel pumps, autohaus, MB, other sellers... I replaced what I think is the same fuel pump in my 63 220S. I went through 3 fuel pumps from Autohaus and others and they all leaked. I finally bought one from the Classic Center that looks exactly the same and it doesn't leak. I have no explanation for this, but it is not inconsistent with others who have reported weaping fuel pumps that are new.

Currently: 1967 250 SL, 1963 220Sb, 1965 300SE Lang, 1971 280SE parts car, 1972 Alfa GTV, 1965 Alfa Duetto, 1993 BMW R100R
Past: 1971 250 C, 1985 300 TD, 1967 250 S, 1968 280 S,1981 300 D, 1982 280CE, 3 Facel Vegas, Borgward Isabella Coupe, Alfa 2600 Sprint, Volvo P1900 (yes), numerous less interesting Volvos, ...
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