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 ShopForum > Technical Information and Support > Diesel Discussion

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 02-06-2009, 03:40 PM
Registered User
 
Join Date: Feb 2009
Posts: 6
reversed jumper cables when jumping battery, now engine wont shut off.

I was in a real big hurry to jump start my 1985 mercedes benz 300D. L5 3.0L diesel, 123.133.
i accidentally reversed the jumper cables. there was a bit of a spark. but the car started up a ran great with no problems after that. but when i went to shut the car off, the ignition system shut off, but the engine kept running. so i took off the fuel line and let it run out of fuel. when i needed to start it up again the next day. it started after a few cranks to re-gain fuel pressure, it ran great again. but it still only shut off the ignition, not the engine. the engine kept running. this time i shut the engine off by cutting off the air to it. now the engine wont start at all.
i am thinking that at first the fuel shut off valve was just stuck in the on position. then when i put my hand over the air intake, it might have jolted the valve into the off position. but how could that be when the valve is vacuum operated? not electrical. or could it really be just the fuel shut off valve. because when i try to start it, it just turns over with no trouble, but wont start as if its not getting any fuel.
what could i have fried when i reversed the cables to make this happen? my email is PoisenSkull@yahoo.com.

Last edited by PoisenSkull; 02-06-2009 at 03:43 PM. Reason: forgot contact info
Reply With Quote
  #2  
Old 02-06-2009, 03:49 PM
Banned
 
Join Date: May 2002
Location: Blue Point, NY
Posts: 25,396
The engine doesn't use any electrical devices to shut itself down. The keyswitch provides vacuum to the shutoff valve on the back of the injection pump and it closes a diaphragm to cut the fuel to the engine.

What most likely occurred is that you disturbed a vacuum line on the driver's side of the engine and a vacuum hose was disconnected.
Reply With Quote
  #3  
Old 02-06-2009, 03:49 PM
::matthew's Avatar
Registered User
 
Join Date: Sep 2008
Location: Tallahassee, FL
Posts: 594
check your vacuum lines. You probably knocked something loose. Look on the driver's side of the engine, middle of the valve cover. Push the button that says stop next time rather than disconnecting a fuel line.

You're going to need to prime the fuel system now that you've run it out of fuel.
__________________
1985 300D cali 190K

http://mercedes.thatchermathias.com/mw300d.jpg
Reply With Quote
  #4  
Old 02-06-2009, 03:56 PM
oldsinner111's Avatar
a parent should die first
 
Join Date: Nov 2008
Location: bristol,tn
Posts: 5,023
You might have burned ignition switch with 24 volts instead of 12.Check all fuse,relays,wiring.
__________________
usaf veteran ecm repair, ex hippy from california,sober,no drugs or alcohol since 1985,bitter old man,waiting for WW3 lost my daughter in 2015, do to her druggie husband,s320 best time with nos 14.6 1/4 mile
Reply With Quote
  #5  
Old 02-06-2009, 04:45 PM
Registered User
 
Join Date: Jan 2002
Posts: 18,353
There is a manual shut off lever on these cars, at the linkage center left of valve cover. Just push it to make the engine shut off if it won't shut off with the key. You probably have sucked air into the fuel system causing the no-start condition. Is your glowlight working?
__________________
1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
Reply With Quote
  #6  
Old 02-06-2009, 04:51 PM
rrgrassi's Avatar
mmmmmm Diesel...
 
Join Date: Jun 2006
Location: Royse City Tx
Posts: 4,868
Actually, that could just short out the battery, alternator, and other electricals, and would not juice it w/24 volts. 2 12 volt batteries in a series would give it 24 volts.

Sounds like a vacuum issue like stated. To shut down under the hood, all you have to do is press the "stop" lever. That is also where to check for lack of vacuum when the key is in the off position. You will need a mity vac as well, and you can test the shut off valve, and to see if vacuum is present when you shut down the engine.
__________________
RRGrassi


70's SPM #5608 Fairmont A-4 MOW car

06 VW Jetta TDI 210K miles

82 300D 322K My Daily Driver-Warndreicke in the trunk. Trip ODO still working!

90 Dodge D250 5.9 Cummins/5 speed. 350K
Reply With Quote
  #7  
Old 02-07-2009, 12:16 AM
Registered User
 
Join Date: May 2007
Location: Out in the Boonies of Hot, Dry, Dusty, Windy Nevada
Posts: 9,585
One the end of the Injection Pump facing the firewall, there is a brown vacuum line connecting to the fuel shut off. It goes through the firewall to the vac. valve on the end of the ignition switch.

A second brown vac. line is the vac. source and it to goes to the ignition switch.

Check to see if you knocked one of those off.

There is a mess of vac. lines inthe area above the oil filter housing, can be confusing trying to figure out what line goes where.

The large black line, comes from the vacuum pump to the brake booster. then vac. is pulled off it to the various systems.

green line is for the climate/AC stuff.

Yellow line supplys the vac. storage under the rear shelf. and a second yellow line goes to the Drivers door for the door locks, trunk and fuel door.
These two lines come off a yellow check valve at the firewall.


I agree you must have air still trapped in the filter or lines from disconnecting the fuel line. the fuel pump or lift pump is down on the side of the Injection pump. you will see either a black cylinder or a round flat knob. If the black one, just pump it up and down, If the other unscrew it, it will pop up and just push it up and down to pump fuel from the tank to purge the air from the system. then push it down and tighten the knob.

I don`t know if I would want to use my hand to block off the air to kill the engine. If you pull the U-Tube to the Turbo and put your hand there, the suction could pull your fingers into the impellers of the spinning Turbo.

Charlie
__________________
there were three HP ratings on the OM616...

1) Not much power
2) Even less power
3) Not nearly enough power!! 240D w/auto

http://i30.photobucket.com/albums/c3...ilys/boobs.gif


Anyone that thinks a 240D is slow drives too fast.

80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff

We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works
Reply With Quote
  #8  
Old 02-07-2009, 01:17 AM
Registered User
 
Join Date: Feb 2009
Posts: 6
electricals are working

thank you for all your advice. much appreciated.
when i try to start the engine up again, all the ignition is working. even the glow plug light. and it turns over normal. but not enough to start. i could check and see if the battery isnt putting out enough juice.
i also checked all the fuses, and they are all ok.
there is a big mess of vacuum tubes to check out, i will check them out in the morning, see whats where.
i will try the primer pump as well. last time i tried it, it sounded like bubbles coming up in the fuel tank or something. how much should i really pump it?
i will try everything. and get back to you after the weekend.
im still learning with this car. it has saved me hundreds running on WVO. so im still putting effort to get it running for spring.
Reply With Quote
  #9  
Old 02-07-2009, 01:35 AM
Registered User
 
Join Date: Feb 2009
Posts: 6
is it possible that i could have ruined the fuel shut off valve? or something in the vacuume system by cutting off the air at the turbo. didnt think of the turbo impellers, i will never do that again. didnt notice a stop button on the linkage either. took another look and slapped myself on the forehead when i saw it. when this car works, it works great. but man there is alot to learn with it.
Reply With Quote
  #10  
Old 02-07-2009, 08:59 AM
Registered User
 
Join Date: May 2007
Posts: 768
Quote:
Originally Posted by PoisenSkull View Post
thank you for all your advice. much appreciated.
when i try to start the engine up again, all the ignition is working. even the glow plug light. and it turns over normal. but not enough to start. i could check and see if the battery isnt putting out enough juice.
i also checked all the fuses, and they are all ok.
there is a big mess of vacuum tubes to check out, i will check them out in the morning, see whats where.
i will try the primer pump as well. last time i tried it, it sounded like bubbles coming up in the fuel tank or something. how much should i really pump it?
i will try everything. and get back to you after the weekend.
im still learning with this car. it has saved me hundreds running on WVO. so im still putting effort to get it running for spring.
Since you are running WVO, and not knowing the type of setup your car has, is it possible you fried an electrical component in the WVO system. I know some cars have two tank systems, one tank systems, and home made systems, so I am only taking a stab in the dark......good luck
__________________
96 E300d
Reply With Quote
  #11  
Old 02-11-2009, 01:54 PM
Registered User
 
Join Date: Feb 2009
Posts: 6
im not running a wvo system. i make the fuel myself.
i primed the fuel system using the primer pump. i have plenty of juice from the battery. glow plug light works. i checked vacuume lines. and the car still wont start. could it be the vaccum switch in the key ignition? i dont know what else it could be.
Reply With Quote
  #12  
Old 02-11-2009, 02:07 PM
blackestate's Avatar
Registered User
 
Join Date: Aug 2005
Location: Washington State
Posts: 948
loosen the nut on the fuel line at an injector, and see if it is puping fuel. Still sounds like air in the system.
__________________
83 300SD Dark Silver Dark brown inside
Reply With Quote
  #13  
Old 02-11-2009, 02:55 PM
Registered User
 
Join Date: Apr 2007
Posts: 226
Disolving fuel lines

If you are making Biodiesel (I assume that is what you ment by "making your own fuel) is that true?

If so -have you changed the orginal fuel lines? Biodiesel will turn the 1985 vintage fuel lines to mush pretty quick and/or degrade the fuel lines enough to allow an air leak.

Common problem-you will need to replace the fuel lines with something compatable with biodiesel.

.Remember that lye & methonal in biodiesel still has the same chemecial properties not good for 1985-era rubber.

Another air culprit is the primer pump-it too can leak in air if damaged or worn

Another good/inexpensive thing is to replace all your crush washers around the filter and primer pump. they can also cause you to loose and not maintain your prime.
Reply With Quote
  #14  
Old 02-11-2009, 03:01 PM
Registered User
 
Join Date: Jan 2002
Posts: 18,353
The most frequent cause of no-start conditions on these MB's is bad glowplugs. Go to dieselgiant.com and follow his glowplug testing procedure.
__________________
1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
Reply With Quote
  #15  
Old 02-11-2009, 03:31 PM
vstech's Avatar
DD MOD, HVAC,MCP,Mac,GMAC
 
Join Date: Mar 2006
Location: Mount Holly, NC
Posts: 25,959
if it's air, since you unhooked the fuel lines... you're going to need to bleed and bleed and bleed.
loosen the bolt on the fuel filter and pump the hand pump until it's free of air.
then loosen all the lines going to the injectors and crank the car until fuel flows freely from each one... it will start.
__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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 04:50 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2011 Pelican Parts - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page