W111, 220 SE - Engine occasionally stops fuel injection system - Mercedes-Benz Forum

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post #1 of 4 (permalink) Old 10-11-2015, 11:13 AM Thread Starter
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Date registered: Aug 2011
Vehicle: w111, 220 SE, automatic, 1964
Location: Norway
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W111, 220 SE - Engine occasionally stops fuel injection system

Hi all, Ive followed this forum a bit on and off as Ive been looking for a decent w111 220S/SE for a while. Some weeks ago I found the car, a 220SE, sedan, 1964. It has been running very well for around 1000 km, however a couple of days ago it suddenly stopped. There has been a leaking fuel hose from the (electric) fuel pump to the fuel line toward the engine. When it stopped it felt like some fuel problem, so I did not worry that much. It started again after around 5 min. Ran for 5 min and stopped again. Happened a couple of time and I was able to get the car back home to the garage without assistance. Today I changed the fuel hose. It started without any problem, and the engine idled well for around 5-10 min before it stopped. Started again and ran well the same amount of time.

My first thought is a failure on the electric fuel pump., however not sure. Im a bit worried whether it could be some failure of the fuel injection system.
Im pretty used to carb engines; however Mercedes fuel injection system is new to me. Any advices of how to continue are appreciated.

Is there any decent diagnostic that can be done? I do not find what Im looking for in the Service manual.

Thanks in advance

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post #2 of 4 (permalink) Old 10-11-2015, 01:13 PM
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I'd check the fuel filters. Could be a rusted gas tank also. Easy to check before throwing money at it.

Good luck.
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post #3 of 4 (permalink) Old 10-11-2015, 09:36 PM
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Vehicle: 1967 250 SL, 1963 220Sb
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I agree with fuel filters, after that fuel pump. The car probably has a fuel filter under the hood with a big canister. But there is also a fuel filter in the inlet to the fuel pump - part of the fitting. Then check the "screen" on the bottom of the gas tank, but do that last as it is a mess (with gas everywhere).

One thing you can do is disconnect the return line from the fuel tank and run a hose into a container. When the key is "on" you should be circulating fuel, or in this case pumping gas from the tank through the injection pump and back to the tank or in this case the collection container. If fuel isn't coming back then you have a fuel pump or filter problem.

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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post #4 of 4 (permalink) Old 10-12-2015, 08:46 AM Thread Starter
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Vehicle: w111, 220 SE, automatic, 1964
Location: Norway
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Thanks. Similar approach was suggested when discussing with car-mates during the weekend. I’ll have a check, and fingers crossed.

Fintail, sedan, 220 SE, 1964
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