1977 Mercedes Benz 450 SEL - Mercedes-Benz Forum
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post #1 of 19 (permalink) Old 06-04-2019, 10:49 PM Thread Starter
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Vehicle: 1977 Mercedes Benz 450 SEL (4.5)
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1977 Mercedes Benz 450 SEL

Hello everyone, I have a 1977 450 SEL with the 4.5L v8 engine. The car has about 211k Miles, but has sat approximately 15 years. I have made several attempts to start the car by changing the fuel pump and fuel filter, and I am going to drop the gas tank to have it cleaned and I am going to clean or replace the fuel injectors. If this doesn't work, I have been considering an engine swap, something more practical such as a sbc chevy 350 engine. I was wondering if anyone has swapped a v8 into their w116. If anyone has done this chevy engine swap, would it be possible to have it run on a carburetor instead of a fuel injection system, and if so, would it eliminate the need of an ecm? here are some pics of the car and the engine.
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post #2 of 19 (permalink) Old 06-13-2019, 02:04 AM
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You should also clean and blow out all fuel lines, front to back, from fuel distributor to tank, and have that cleaned too.
In the old days, people used coax back to life fuel pumps by reversing polarity to back flush and get some of the crud out. Its not a permanent fix though.

Please fill out your profile (see attachment).
Daimler Benz made different versions of same model cars for different parts of the world, and to get the correct advise, location can be important.
It might help with responses too.
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post #3 of 19 (permalink) Old 06-13-2019, 07:13 PM Thread Starter
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how would you recommend i clean the fuel lines from the distributor to the tank?
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post #4 of 19 (permalink) Old 06-13-2019, 07:15 PM Thread Starter
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how would you recommend i clean the fuel lines from the distributor to the tank?

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Originally Posted by Teutone View Post
You should also clean and blow out all fuel lines, front to back, from fuel distributor to tank, and have that cleaned too.
In the old days, people used coax back to life fuel pumps by reversing polarity to back flush and get some of the crud out. Its not a permanent fix though.

Please fill out your profile (see attachment).
Daimler Benz made different versions of same model cars for different parts of the world, and to get the correct advise, location can be important.
It might help with responses too.
Cheers
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how would you recommend i clean the fuel lines from the distributor to the tank?
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post #5 of 19 (permalink) Old 06-14-2019, 12:17 AM
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how would you recommend i clean the fuel lines from the distributor to the tank?
Solvent and compressed air, after you open the sections.
The special google search box top right is easier to use than the cumbersome forum search.
Lots of info in the forum archives.

You are asking for assistance, but can't be bothered to complete your profile?
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post #6 of 19 (permalink) Old 06-14-2019, 08:00 AM
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Does it briefly start if you put a splash of fuel into the airflow sensor?

I know those cast iron fuel distributors hate sitting for long periods with no action. If you press down on the circular plate, does it go all the way down and come back up on its own?
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post #7 of 19 (permalink) Old 06-15-2019, 07:29 AM
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Poor old girl. These were made of strong stuff, and at least she was laid up before ethanol became so prevalent in fuel, I think.
She'll run again I'm sure.

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post #8 of 19 (permalink) Old 06-15-2019, 01:24 PM
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Quote:
Originally Posted by jv420 View Post
how would you recommend i clean the fuel lines from the distributor to the tank?
disconnect the fuel in and fuel return from the fuel disti and connect with hose. jumper fuel pump relay and run for 10 minute.

After sitting 15 years and being 40 years old already I would suspect you need the fuel distributor and WUR rebuilt. http://www.cisflowtech.com/ is the place to go.

Remove the filter in the bottom of the tank and replace all rubber hoses in the fuel system.

Last edited by rumb; 06-15-2019 at 01:27 PM.
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post #9 of 19 (permalink) Old 06-18-2019, 10:55 AM Thread Starter
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Quote:
Originally Posted by Nutz 4 Benz View Post
Does it briefly start if you put a splash of fuel into the airflow sensor?

I know those cast iron fuel distributors hate sitting for long periods with no action. If you press down on the circular plate, does it go all the way down and come back up on its own?
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Yes, whenever i put gasoline into the airflow sensor the car wants to start, also when i run power to the thermo-time switch directly from the battery, it wants to start. One time it did for about 5 minutes, but as soon as i gave it gas it turned off.
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post #10 of 19 (permalink) Old 07-05-2019, 10:22 AM Thread Starter
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is there a possibility that I could just install a fuel cell in the trunk instead of cleaning the fuel lines? I am not sure if they are universal or if it would work in the 450 SEL.
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