Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help




Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Vintage Mercedes Forum

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 11-28-2014, 09:37 PM
Registered User
 
Join Date: Sep 2005
Posts: 342
Running rich

Hi all,

I had a problem with fuel supply that I recently resolved. Now I can get her to start and she'll rev high ~2000 RPM and slowly go down and stall. Checking the plugs I see black suit build up. I cleaned up the plugs and it's still doing it.

Any advice?

Thank you in advance.
__________________
72 250 M130 W114
Reply With Quote
  #2  
Old 12-15-2014, 01:08 PM
Registered User
 
Join Date: Sep 2005
Posts: 342
Anybody?

She still won't idle. as soon as I let go of the throttle, she stalls.
__________________
72 250 M130 W114
Reply With Quote
  #3  
Old 12-15-2014, 01:23 PM
Registered User
 
Join Date: Jul 2012
Location: Mooresville, NC
Posts: 142
Need more info to help you... Zenith carbs correct? What did you solve? A few things that may be causing the rich condition... Float levels? Fuel pressure? Jets correct? Choke setting?
__________________
1968 230 W110
1985 300TDT W123/S123
Reply With Quote
  #4  
Old 12-16-2014, 12:47 AM
Registered User
 
Join Date: Apr 2011
Location: Toronto, Canada
Posts: 181
I'd start with the float level - make sure it's within spec. I used this reference:

Mercedes Benz Zenith Carb Manual | JaimeKop.com

Open up the carbs and make sure that the passageways and jets are clean, the throttles close and the float valve is working smoothly. Set the choke and fast idle on the front carburetor to spec and install.

If you have no vacuum leaks, it should start and run ok. Have you run through these checks?
__________________
1968 Mercedes 280S - The Demon Car
Reply With Quote
  #5  
Old 12-16-2014, 05:49 PM
Registered User
 
Join Date: Sep 2005
Posts: 342
Yes, I have zethins. The probem was I would not get fuel but I would get pressure from the new pump. Replaced the fuel lines.

I have checked the floats. They're within specs. Pressure is correct. 3-4 PSI

Carbs were disassembled, cleaned, air passed through all the openings. I'll go through the manual and check everything else. Any ideas would be greatly appreciated.
__________________
72 250 M130 W114
Reply With Quote
  #6  
Old 12-16-2014, 06:39 PM
Registered User
 
Join Date: Apr 2011
Location: Toronto, Canada
Posts: 181
Have you tried isolating the fault by routing the fuel pump inlet into a Jerry can of gas? That will isolate any blockage on the lines and tank.
__________________
1968 Mercedes 280S - The Demon Car
Reply With Quote
  #7  
Old 12-18-2014, 12:55 AM
Registered User
 
Join Date: Dec 2014
Posts: 10
Quote:
Originally Posted by ggenovez View Post
...Checking the plugs I see black suit build up...
That'll definitely cause problems, if you are having black suits clog the engine!!! I hope it's a cotton and wool blend, as rayon will melt in the combustion chamber! Just joking with you, I know you meant soot. I'd say it sounds like something is sticking or clogged. You might need to redo that carb rebuild.
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -4. The time now is 01:55 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page