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 > Diesel Discussion

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 10-20-2004, 06:21 PM
andyofgeorgia
Guest
 
Posts: n/a
87 300SDL just keeps on going

As a new diesel owner, it's the simple things that mystify you. My 300SDL now refuses to stop running when I turn off the key.

I've been trying to decipher the Repair Manual CDROM and figure out what mechanism is supposed to stop the engine, but no luck yet.

Last week I replaced the fuel line feeding directly into the engine (which is when the problem started). The previous one was allowing air into the line. The new fuel line is slightly bigger that the last one, so I assumed that the engine kept running merely because it was getting too much gas. However, I tried a quick fix by tightening a hose clamp to restrict the fuel flow - didn't change a thing. The old girl just chugs along until I get out of the car, pop the hood, and hit the kill switch.

Any wisdom for an aspiring DIY shade-tree mechanic? Will I have to find a smaller fuel line, or does that make a difference? Is it an electrical system that kills the engine?

Andy

87 300SDL 289,000miles

Reply With Quote
  #2  
Old 10-20-2004, 06:27 PM
1985 300SD Sady's Avatar
Star Crazy
 
Join Date: Sep 2004
Location: Cincinnati, Ohio
Posts: 1,038
Check your vacuum lines, the cutoff swich is vacuum operated. The white plastic box next to the ALDA on top of the Injection Pump is the cutoff. Make sure those lines are good, and connected properly.
Reply With Quote
  #3  
Old 10-20-2004, 07:20 PM
Registered User
 
Join Date: Aug 2001
Location: Evansville, Indiana
Posts: 8,150
Andy:

Most likely you pulled a vac line off while changing the fuel line.

The brown plastic line is the supply, the brown line with a blue stripe connects to the vac servo on the IP to shut the engine off.

Use the stop lever to kill the engine until you get it fixed.

There is also the possiblity that the servo died, you are about the right milage.

Use a MitiVac hand pump to test -- engine should stop instantly when you apply vac to the servo with the hand pump. If it doesn't, or the vac leaks down, replace servo.

Peter
__________________
1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
Reply With Quote
  #4  
Old 10-20-2004, 08:39 PM
Hatterasguy's Avatar
Zero
 
Join Date: Nov 2002
Location: Milford, CT
Posts: 19,307
Mine did the same thing the servo wouldn't hold vacuum. They are about $46 for a Bosch metal one. Cheaper plastic ones are less but I hate plastic crap.

__________________
2020 GMC Sierra Denali
2007 Tiara 3200
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 11:21 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2020, 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