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 04-09-2009, 11:03 PM
Registered User
 
Join Date: Apr 2009
Posts: 7
Fuel Starved '78 300D

Hello,
I just replaced the IP on my '78 300D and get no fuel out of the injector pipes.

I aligned the notch in the spline and collar before installing at 24 Deg. BTDC, adjusted the fuel flow by both drip and bubble method, and have a gush of fuel if I open the banjo to bleed the air.

The pump doesn't deliver fuel when I spin the motor with the starter.

Could it be that whatever the IP collar engages is faulty? Is there a way to check that, or whether or not the IP pistons are operating correctly?

Regardless of timing, or any other factor, shouldn't the pump blast fuel out of the injector pipes?

Any assistance will be greatly appreciated.

Reply With Quote
  #2  
Old 04-09-2009, 11:12 PM
Registered User
 
Join Date: Jan 2002
Posts: 18,350
Did you prime the living daylights out of it?
__________________
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
  #3  
Old 04-09-2009, 11:15 PM
Registered User
 
Join Date: Apr 2009
Posts: 7
Yes, using the hand pump. I also have an electric fuel pump under the hood. A leftover from the WVO system that was previously installed.
Reply With Quote
  #4  
Old 04-10-2009, 11:01 AM
Registered User
 
Join Date: May 2004
Location: Flowood Mississippi
Posts: 438
IP

Always a good idea to see what pressure is inside the IP Fill chamber..
You can tee a 0-30 psi gauge into the line between the filter and IP and read while cranking engine ...
Should have 5~15 psi from lift pump through filter to IP...
This would eliminate IP barrel fill as a problem area if the pressure is ok....
__________________
1978 Yellow 300D (The Mustard Toad)
1980 Blue 240D (The Iron Toad)
1989 Grey Mitsu.4WD Mighty Max Pickup (Needs a Diesel transplant bad)

(Open the pod bay doors HAL)
Reply With Quote
  #5  
Old 04-10-2009, 01:09 PM
Diesel911's Avatar
Registered User
 
Join Date: Sep 2007
Location: Long Beach,CA
Posts: 51,038
Loosen the Hard Line Nuts and see if you are getting Fuel up to the Injectors. This will also Bleed the air from between the IP and the Injectors.
Even if the IP happend to be out of time you should still get Fuel up to the Injectors.
If you are getting fuel to the Injectors and it is still not starting I would check to make sure the IP was timed on the Compression Stroke of #1.
__________________
84 300D, 82 Volvo 244Gl Diesel
Reply With Quote
  #6  
Old 04-12-2009, 02:13 PM
Registered User
 
Join Date: Apr 2009
Posts: 7
I've loosened the hardlines at the injectors and get only a dribble of fuel.
Not very impressive for a "high pressure system".
I'm expecting to see a spray of fuel. Shouldn't that be so, regardless of timing?
A timing issue I can deal with. Am I expecting too much in the way of pressure? Or could the problem be the drive mechanism to the IP spindle?
Reply With Quote
  #7  
Old 04-12-2009, 02:26 PM
Registered User
 
Join Date: May 2004
Location: Flowood Mississippi
Posts: 438
IP

Still a good idea to see what the IP feed pressure is between the filter and input to IP...
__________________
1978 Yellow 300D (The Mustard Toad)
1980 Blue 240D (The Iron Toad)
1989 Grey Mitsu.4WD Mighty Max Pickup (Needs a Diesel transplant bad)

(Open the pod bay doors HAL)
Reply With Quote
  #8  
Old 04-12-2009, 07:26 PM
Diesel911's Avatar
Registered User
 
Join Date: Sep 2007
Location: Long Beach,CA
Posts: 51,038
Quote:
Originally Posted by BigRatFink View Post
I've loosened the hardlines at the injectors and get only a dribble of fuel.
Not very impressive for a "high pressure system".
I'm expecting to see a spray of fuel. Shouldn't that be so, regardless of timing?
A timing issue I can deal with. Am I expecting too much in the way of pressure? Or could the problem be the drive mechanism to the IP spindle?
Because the Hard Line Nut is loose and the cranking speed is slow it is not going to spurt out like it does if you loosen the same Nut while the Engine is running.
Also ounce the Hard Line Nut is loosend it is not so much pressure as it is velocity that would make the fuel spurt out. This is related to the Cranking Speed of the Starter.

If you want to try this- Remove one hard line completely and crank the Engine. The fuel should shoot up out of the IP Delivery Valve Holder 1-2 inches. However, It will not be a large fuel quanity.
If it will spurt out like that you are getting enough fuel.

Have you tried to see if the Engine will start on WD-40 sprayed in the intake?
__________________
84 300D, 82 Volvo 244Gl Diesel

Last edited by Diesel911; 04-13-2009 at 01:54 AM.
Reply With Quote
  #9  
Old 04-13-2009, 09:10 PM
Registered User
 
Join Date: Apr 2009
Posts: 7
Thanks for the suggestions, so far, but nothing has worked.
I removed the pipe from the IP and I do get a stream of fuel shooting up in the air.
I also tried to start it with WD-40, but it won't fire.
I also checked the glow plugs and power flows all the way from 5 to 1.
Any other ideas? I'm at a total loss.
Thanks in advance.
Reply With Quote
  #10  
Old 04-13-2009, 10:07 PM
Registered User
 
Join Date: Nov 2004
Location: Nova Scotia, Canada.
Posts: 6,510
Divide and conquer. Since the engine refuses to start on wd-40. I hope you had the cover off and sprayed between the filter and intake.

I would critically check the glow plug system. Did you mention why you changed the injection pump? I just rechecked and you did not.

If for a no start condition the glow plug circuit for certain has to really be verified and if that turns out good perhaps a compression check is in order.

This is based on something should have occured with the wd40 and a working glow plug system. If you read the glow plug voltage to ground as the same down the series string it is inoperative. This is a 1978 with the squiggly wires?


Last edited by barry123400; 04-14-2009 at 06:25 PM.
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 06:57 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2024 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page