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  #1  
Old 10-12-2017, 11:02 AM
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1967 300SEb Mechanical Fuel Pump

I am looking for a mechanical fuel pump for a 1967 Mercedes 300SE which I believe is actually called 300SEb (information from the Wikipedia website).

The mechanic says that the manual fuel pump does not work as it should and if I understood correctly, there is also an oil leak around it. My research has found that the fuel system was a Bosch mechanical injection.

I see that the 300SEL also used the Bosch mechanical injection. I found this fuel pump listed for the 1967 300SEL but do not know if this is what is needed or if it is identical to what would have been used on the 300SEb

1967 Mercedes-Benz 300SEL Base Sedan - Fuel System - Page 2


Any suggestions on what part number I should be looking for and where I might find it?

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Old 10-12-2017, 11:50 AM
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A 1967 300SE has an electric fuel pump at the rear of the car and a mechanical injection pump in the engine compartment. There is no "mechanical" fuel pump as you would find in a non-fuel injected car.

If the mechanic says there is oil leaking around the fuel pump, he is probably talking about the fuel injection pump as there is no oil at the electric fuel pump at the rear of the car.

For the electric fuel pump you can buy them rebuilt for much less than the cost new. For the injection pump, you have it rebuilt buy one of a few reputable rebuilders.

Ask the mechanic again what is wrong before you buy anything.
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Old 10-12-2017, 03:39 PM
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Quote:
Originally Posted by jonosso View Post
I am looking for a mechanical fuel pump for a 1967 Mercedes 300SE which I believe is actually called 300SEb (information from the Wikipedia website).

The mechanic says that the manual fuel pump does not work as it should and if I understood correctly, there is also an oil leak around it. My research has found that the fuel system was a Bosch mechanical injection.

I see that the 300SEL also used the Bosch mechanical injection. I found this fuel pump listed for the 1967 300SEL but do not know if this is what is needed or if it is identical to what would have been used on the 300SEb

1967 Mercedes-Benz 300SEL Base Sedan - Fuel System - Page 2


Any suggestions on what part number I should be looking for and where I might find it?

I believe that your pump is either a Bosch ZEA or ZEB, could be wrong
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Old 10-12-2017, 03:44 PM
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Originally Posted by strelnik View Post
I believe that your pump is either a Bosch ZEA or ZEB, could be wrong
That is not correct. The electric fuel pump at the rear of the car will be like the one in the link that the original poster provided.
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  #5  
Old 10-12-2017, 08:03 PM
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Originally Posted by ScooterABC View Post
That is not correct. The electric fuel pump at the rear of the car will be like the one in the link that the original poster provided.
He is not talking about the electric pump.

Mechanical Injection pump is a ZEA or ZEB.

2 plunger or 6 plunger .depending on which engine .

A 300se in a 108 is a rare car.

Look at the chassis # and post it. I will then post the correct MFI pump R #.

A Dalton
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Old 10-12-2017, 08:09 PM
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Quote:
Originally Posted by Arthur Dalton View Post
He is not talking about the electric pump. Mechanical Injection pump is a ZEA or ZEB. 2 plunger or 6 plunger .depending on which engine . A 300se in a 108 is a rare car. Look at the chassis # and post it. I will then post the correct MFI pump R #.
If it's 1967 it's 6 plunger. But that really doesn't matter. Is this an M189 car or an M130 car or....? I would guess M189, which means it's going to have it's own special injection pump. But that STILL doesn't matter because it's not something he is going to go and buy. He's going to have his rebuilt.

I'm coping with my 1965 300SE lang and the glorious / dreaded M189 engine. This is not an engine that you want to have problems with.

Did he say it's a 108 instead of a 109? I guess that makes the suspension less of an issue...
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Old 10-12-2017, 08:48 PM
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The point is Strilniks post was not incorrect...

your post correcting him was the incorrect posting.
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Old 10-12-2017, 10:47 PM
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Originally Posted by Arthur Dalton View Post
The point is Strilniks post was not incorrect...
your post correcting him was the incorrect posting.
I guess it would be really useful if we could say "Fuel Pump" for fuel pump and "Mechanical Injection Pump" for injection pump. Whether the injection pump is ZEA or ZEB is irrelevant because no one is going to go buy one - the existing one is going to get rebuilt.

But I still think that I am correct. Both ZEA and ZEB pumps are 2 piston pumps. A 1967 car isn't going to have a 2 piston pump, it's going to have a 6 piston pump.

Attached are pics of the 6 piston injection pump on the M189 engine of my 1965 300SE sedan.
Attached Thumbnails
1967 300SEb Mechanical Fuel Pump-injectionpump1.jpg   1967 300SEb Mechanical Fuel Pump-injectionpump2.jpg  
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  #9  
Old 10-12-2017, 10:51 PM
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https://www.sl113.org/wiki/Fuel/Injection
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  #10  
Old 10-12-2017, 11:48 PM
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<<<< guess it would be really useful if we could say "Fuel Pump" for fuel pump and "Mechanical Injection Pump" for injection pump.>>>

Yes.

..and most with knowledge of these MFI systems do , in fact, do exactly that.
They refer to The electric feed pump as simply the Fuel Pump and the mechanical injection system pump as Injection pump.
The orig posters does not realize that his mechanic was likely referring to the injection pump as the cause of his problems, whereas he assumed he meant the fuel feed pump.
Strelnik was simply attempting to bring that to his attention..that's all.

A chassis # from the O/P would get the specifics, as I don't think he is sure about which model he has...an neither do we.
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Last edited by Arthur Dalton; 10-12-2017 at 11:53 PM. Reason: sp
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  #11  
Old 10-12-2017, 11:54 PM
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Originally Posted by Arthur Dalton View Post
A chassis # from the O/P would get the specifics, as I don't think he is sure about which model he has...an neither do we.
Actually given the ambiguity of his car, I think the entire VIN would be useful. (Is the OP following this thread???) You are correct - we need to know the actual car. Either way, 1967 is going to be a 6-piston injection pump. But his car could be an M130 car or an M189 car. Those will have different injection pumps.

It sounds like his mechanic isn't really up to the task. Telling him to order a new injection pump is not good advise.

Hopefully OP will return and tell us more about his car.
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  #12  
Old 10-13-2017, 12:02 AM
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Yes

Could also be an orig M189 car with a M130 replacement engine.
That was a popular changeout back then.

Better than Chassis # , just post the pump data plate info. and case closed.
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  #13  
Old 10-13-2017, 12:15 AM
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Quote:
Originally Posted by Arthur Dalton View Post
Yes

Could also be an orig M189 car with a M130 replacement engine.
That was a popular changeout back then.

Better than Chassis # , just post the pump data plate info. and case closed.
He's not gonna know how to do that. Let's start with the VIN.

On my 65 300SE lang I actually bought a 72 280SE with a rebuilt engine just in case I couldn't get the M189 running. Turns out I could. But now I'm losing interest in working on cars, so I'm going to sell it. The 280SE is already gone.

It doesn't really matter which Injection Pump he has -- whatever it is, it's going to get sent for rebuilt (if it actually needs it, which is unclear given his mechanic's familiarity with the cars.
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  #14  
Old 10-09-2022, 12:13 PM
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Soooo… it is just shy of 5 years since the original post and I have learned a lot in that time period. The 1967 300SEb was purchased new in 1967 by my great uncle. He took delivery of it in Stuttgart in June 1967. Hy cousin (his daughter) offered me the car in 2006, and in November 2021 I FINALLY picked it up. The VIN is 10801512002509 and it still has the original M189 engine with the Bosch mechanical fuel injection system.

As some individuals noted, the mechanic that had looked over it in the past was somewhat clueless as to what needed to be done. After getting the car, I found an amazing mechanic (Bob Kunsak from RK Industries). He spent a lot of time with the car addressing the engine performance issues. As it turns out, there was nothing wrong with the Bosch system at all. The car now runs flawlessly with full power.
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  #15  
Old 10-09-2022, 11:15 PM
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That's a fantastic follow-up post! I'm glad the car is alive and well. The FI system on these cars is pretty robust, so I'm not surprised.

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