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  #1  
Old 05-30-2007, 12:45 PM
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Thumbs up Solex 4A1 fuel supply/return lines?

Anyone tell me which lines are the supply and return to the carb? I am in process of cleaning the old fuel system and would like to start the vehicle on a separate fuel circuit.

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  #2  
Old 05-31-2007, 11:14 PM
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Supply/return

Today, I purchased a W116, 280S with the Solex card.
The Supply/return lines are connected with a "T" just above the fuel filter.

This doesn't seem correct, so I was wondering if the return is supposed to feed from the carburator. Thanks in advane.
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1970 280S M130 engine- good runner
1971 250 M130 engine- #2 rod bearing, gone
1971 280SE (blown engine,parts car)
1977 German 280S W116-only 33 years old
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Old 06-01-2007, 07:15 AM
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Most Solex 4A1's have a fitting which screws into the front of the carb. This is a vacuum controlled fitting. They might have this fitting in-line before the carb but they are all vacuum controlled. If you have just a "tee" then someone has re-engineered the set-up.
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Old 06-01-2007, 09:17 PM
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Question Return line location

Thanks Mike for answering. Just to clarify, the return should be connected to the Slox in a different location than the supply inlet. Correct?
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1970 280S M130 engine- good runner
1971 250 M130 engine- #2 rod bearing, gone
1971 280SE (blown engine,parts car)
1977 German 280S W116-only 33 years old
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Old 06-02-2007, 07:50 AM
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The return should be in the supply line. The 4A1 carb itself does not have an overflow or return outlet.
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  #6  
Old 06-02-2007, 03:37 PM
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Thanks, Mike

Initially, I want to correct the "hack job" some "mechaic" did to this car. Not only was the "Tee" installed, but the vauum advance to the carb was dis-connected (and plugged at the card).

The vacuum retard port on the distributor was left open, and I need to trace its' end point, too.
The archives of this forum suggested running the vacuum retard to the intake, which was the solution on my 1970 280s. Thanks.
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1970 280S M130 engine- good runner
1971 250 M130 engine- #2 rod bearing, gone
1971 280SE (blown engine,parts car)
1977 German 280S W116-only 33 years old
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Old 06-02-2007, 06:58 PM
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Vacuum retard is controlled by a solenoid on the fenderwell. You have vacuum supplied to the solenoid and it is controlled/triggered by a temperature sensor. It is not a straight connection.

Fuel return is a straight connection supplied directly from the carb.
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Old 06-05-2007, 04:02 PM
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Thumbs up

Quote:
Originally Posted by MunichTaxi View Post
Today, I purchased a W116, 280S with the Solex card.


What's this Solex card you have?
__________________
I'm not a doctor, but I'll have a look.

'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

Liberty will not descend to a people; a people must raise themselves to liberty.
[/IMG]
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  #9  
Old 06-06-2007, 03:32 AM
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Don't have a carb #....

but I am assuming it is the Solex 4A1. Hmmm... maybe on a 1977 Euro-spec the Germans used a different carb? I'd better check this out this weekend.

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1970 280S M130 engine- good runner
1971 250 M130 engine- #2 rod bearing, gone
1971 280SE (blown engine,parts car)
1977 German 280S W116-only 33 years old
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