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  #1  
Old 06-03-2013, 10:29 PM
Jub Jub is offline
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Extra hose..?.zenith to weber conversion w114

A while back I converted my zeniths to webers, and the cars been running great ever since. However, there was a tube that used to run to the zeniths that I could never figure out where it hooked up to on the webers (see attached). I just plugged it. Anyone know what it is?
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  #2  
Old 06-07-2013, 04:25 PM
Pooka
 
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Can you post larger photos that show more of the engine area this is located in?
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Old 06-07-2013, 05:54 PM
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Presumably the tube in question does not have just one end; so, what is the other end connected to?
Knowledge of both the trunk end, as well as the tail end of the elephant, may expand one's understanding of the beast.
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Old 06-09-2013, 08:10 AM
Jub Jub is offline
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Here is the end that went to my zenith
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  #5  
Old 06-09-2013, 08:18 AM
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I was looking through old photos, and I believe it is the lower tubing (see below)
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  #6  
Old 06-09-2013, 08:20 AM
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This is best photo of other end
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  #7  
Old 06-09-2013, 10:24 AM
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[QUOTE=Jub;3155712]A while back I converted my zeniths to webers, ...

Did you do the work? Did you install a new fuel line? Did you leave the old fuel line in place?
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  #8  
Old 06-09-2013, 10:23 PM
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That looks like the original fuel return line from the carb to the tank. The Webers probably don't have a provision for the return line.

I don't know what that gismo is on the one end. Every return line I've seen goes from the return valve on the carb to rubber tubing to steel and then straight back to the tank.

In the photo, you can see the return valve on your original Zeniths.
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Old 06-10-2013, 05:01 PM
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Quote:
Originally Posted by Carpenterman View Post
That looks like the original fuel return line from the carb to the tank. The Webers probably don't have a provision for the return line.
I believe that is correct. What year is your W114? If it is an automatic, did you have problems with the wire from the zeniths to the auto transmission? (given that the webers have no provision for this...)
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  #10  
Old 06-10-2013, 10:02 PM
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Fuel return line...hmm

So, when I bought this car from the previous owner he had attempted to rebuild his original zeniths but was unsuccessful (took it to a few different shops, but could never get them working). I could see the frustration in his eyes, and so I was hesitant to go down this road. I opted to swap to new webers. Then, as luck would have it I ran into this gorgeous 250 coupe (I could tell it was a labor of love; massive side end damage). I popped the hood, pulled off air filter...and there they were...webers!!! (And both for $60 bucks!!!).

Long story short, installed them...turned the key...and the engine started right up. So you bet I installed them, but no I didn't see any return line on webers (w114 automatic 1971). The wires that hooked up to auto choke I left disconnected (read somewhere that they weren't deal breakers for warmer environments).
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  #11  
Old 06-10-2013, 10:12 PM
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Originally Posted by Jub View Post
(And both for $60 bucks!!!).

Long story short, installed them...turned the key...and the engine started right up. So you bet I installed them, but no I didn't see any return line on webers (w114 1971). The wires that hooked up to auto choke I left disconnected (read somewhere that they weren't deal breakers for warmer environments).
I had a 1971 250C with Zeniths and I have a 1968 250S/280S with Webers. Your transmission in the 1971 is late enough that I don't think there is a no-throttle sensor in the carbs to deal with. Having said that, I don't understand why you would not connect the auto choke wires. You will get a better and lower idle speed and it will work in all temperatures. My M130 will idle about about 650 rpm... not that I particularly want it to.

Just FYI, the two wires to the choke are hot when the car is on, and nothing when the car is off. So all they do is gradually warm up the springs in the chokes so they open over time. If you aren't getting power to the chokes then the a fuse in a auxiliary fuse box (on the passenger side near firewall on my 280S) is burnt out.

I had a fair amount of trouble balancing the carbs and getting full-throw on the accelerator linkage, but that had more to do with the linkage than anything else...
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  #12  
Old 06-11-2013, 06:14 PM
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ScooterABC,
Better idle with auto choke engaged, interesting.
So, originally I did hook the lines up. I was so thrilled the car started and held idle in drive, the first place I went was to this MB expert mechanic in silver spring, md to get the carbs synced and adjusted. About 5 days later I got the car back and noticed he had actually disconnected them? It ran well, and his shop is highly reputable so I kind of figured he did this purposefully. Maybe, based on what you say, I'll re-wire them.
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  #13  
Old 06-11-2013, 07:15 PM
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Originally Posted by Jub View Post
ScooterABC,
Better idle with auto choke engaged, interesting.
So, originally I did hook the lines up. I was so thrilled the car started and held idle in drive, the first place I went was to this MB expert mechanic in silver spring, md to get the carbs synced and adjusted. About 5 days later I got the car back and noticed he had actually disconnected them? It ran well, and his shop is highly reputable so I kind of figured he did this purposefully. Maybe, based on what you say, I'll re-wire them.
I don't understand how the carbs could properly be tuned with the choke disconnected. Seems like it would have to run rich when cold to start and then always run rich. On a related note, I took my 250S/280S with webers to the Weber carb place for tuning. They installed electronic ignition, rejetted something, set the timing, and now the car is wonderful. I don't think a Mercedes shop is the place to take a car with Weber carbs. It's just not common for them.
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  #14  
Old 06-12-2013, 10:19 PM
Jub Jub is offline
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Swapped to Pertronix as well...

New Bosch cables, Beck-Arnley diz cap & rotor, ballast resistor, platinum spark plugs, and 12 volt battery.

Thinking about replacing the starter, but need to do a little research on this...
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  #15  
Old 06-12-2013, 10:41 PM
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Thinking about replacing the starter, but need to do a little research on this...
For what reason?
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