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
  #16  
Old 09-13-2009, 01:35 PM
Registered User
 
Join Date: Nov 2004
Location: Nova Scotia, Canada.
Posts: 6,510
I would gravity feed the injection pump with fresh diesel. Remove the hard lines as well from the injectors. Something has to come out of the delivery valves. That is unless they are so gummed up they cannot function. If so any fuel pushed into the hard line is immediatly sucked back into the pump on the next return stroke.

Or the injection pump is either shut off or gummed up horribly inside. I have to even wonder if the elements pistons might be in gummy bores that keep them from doing their cycles. Just sitting at the top of their strokes.

With the hard lines open the pump element has to make only a few pounds pressure to expell fuel. All elements would not go totally bad. Sure they might have damaged bores that prevent them from reaching the opening pressure of the injectors. But with the injector load removed they would still normally flow.

The injection pump is an extrememly sophisticated mechanical device machined to really tight tollerances. It does not take too much to really mess them up. No allowance was made for what some of them are subjected to with some alternative fuels by the original manufactures.


Last edited by barry123400; 09-13-2009 at 01:52 PM.
Reply With Quote
  #17  
Old 09-13-2009, 01:44 PM
JEBalles's Avatar
Registered User
 
Join Date: Jun 2008
Location: Carlisle, MA
Posts: 1,225
Quote:
Originally Posted by Mercury View Post
With injector lines removed , no fuel comes out. tried with fuel shutoff vacuum line attached and again removed.
Single tank, 50/50 wvo/diesel mix summer, 30 wvo/70 diesel winter.
filtered to 1 micron, dewatered, hot pan has very small bubbles indicating smaller presence of water then pump diesel. biocide and cetane boost each tank.
If you see bubbles, that's too much water. What are you doing to dewater?
__________________
1983 240D 3.0T 4-speed manual, now sold

1989 Subaru GL Wagon 5-speed Touring Edition
Reply With Quote
  #18  
Old 09-13-2009, 07:32 PM
1984 300d
 
Join Date: Apr 2006
Location: Austin, TX
Posts: 102
I removed the front three hard lines, and did get some spurts. Then reattached the lines and finally got fuel out of the injector end. I have had the lines off before, but never had to crank so long to get fuel out. I am doing this with the vac line removed from the fuel shutoff valve. Still no starting. Good thing the battery is new.
__________________
Mercury is a boxer

1984 300d
1999 Prelude
Medici road bike
Klein touring bike
Klein mtn bike
Reply With Quote
  #19  
Old 09-14-2009, 01:15 AM
Registered User
 
Join Date: Nov 2004
Location: Nova Scotia, Canada.
Posts: 6,510
Perhaps it's time to verify the glow circuit is fine and the Injectors are not clogged up. Then do a compression check if those both check out and you seem to have fuel.
Reply With Quote
  #20  
Old 09-14-2009, 01:41 AM
Diesel911's Avatar
Registered User
 
Join Date: Sep 2007
Location: Long Beach,CA
Posts: 29,974
Quote:
Originally Posted by lietuviai View Post
That doesn't sound good. Sounds like it may be clogged delivery valves to me but I am no IP expert.
I'm just wondering if by trying to remove one the delivery valves like it's done in the timing procedure to see if fuel dribbles out, could test to see if the pump itself is at fault or not.
I would see if one of our more IP knowledgeable members could chime in on this.

I do not know about WVO issues but when customers used to bring in their Inline Fuel Injections pumps you could put a wrench on the Drive Gear Retaining nuts and turn it by hand and they almost always spurted some fuel out; even when they been drained out the fuel from it when removed from the vehicle.

Below is a generic type Element/Plunger and Barrel. Something could be clogging the feed hole seen above the alignment slot.
Or; the Plungers could be sticking all the way in the UP position.
Or; as suggested the Delivery Valve could be being gumed up and held open (I do not think this would cause no deliver to the Injectors though)

The Delivery Valve Holder, Spring and the Delivery Valve assembly could be removed to view if the Plunger is going up and down while the Engine is rotater by hand but you need to be careful. If the Barrel rises above the Alignment Slot it might not go back in correctly.

__________________
84 300D, 82 Volvo 244Gl Diesel
Reply With Quote
  #21  
Old 09-14-2009, 01:44 AM
TylerH860's Avatar
KHAAAAAAN-gress
 
Join Date: Aug 2007
Location: Wichita, Ks
Posts: 5,187
I have a spare turbo IP I'm selling for cheap.
__________________
1985 500SL Euro w/ AMG bits 130k
1984 300SD Turbodiesel 192k
1980 240D Stick China 188k
2001 CLK55 AMG 101k
2007 S600 Biturbo 149k Overheated Project, IT'S ALIVE!!!
Reply With Quote
  #22  
Old 09-15-2009, 02:11 PM
1984 300d
 
Join Date: Apr 2006
Location: Austin, TX
Posts: 102
Diesel911, give me a chance to find a picture of the IP, I know I have seen one on the forum while reading other IP issues. I give all diagnostics advise a try.

Tyler, I sent you a message.
__________________
Mercury is a boxer

1984 300d
1999 Prelude
Medici road bike
Klein touring bike
Klein mtn bike
Reply With Quote
  #23  
Old 09-15-2009, 04:28 PM
MBFL
 
Join Date: Jul 2009
Location: Pensacola
Posts: 21
Quote:
Originally Posted by Mercury View Post
1984 300d, 151k will not start

Over the last few months several symptoms were observed.
Idle continued to get rougher with a lower rpm, Idle screw was continually adjusted in to max, ramp damper was set full in.
No power coming off of idle, but high speed response ok.
Cold power (in Texas summer) was very bad, got a little better as engine warmed up.
The last night it actually ran, I had to keep throttle wide open at stops, or the engine would die.
I was then able to run a diesel purge through, but it did not start afterwards.

What I have done:
Replaced all three filters.
Replaced lift pump
Streched the fuel return spring out
Used temp fuel tank in the engine compartment (think diesel purge) as source and return of fuel with no change

Observations:
When cranking, fuel comes out the return line, but will not come out of any of the cracked inector lines
Spray pattern and pop (1900psi) of injecters are good.
Disconected the vacuum line into the fuel shutoff valve.
Used external vacuum to test fuel shutoff valve, and could hear it open and close.
I have run WVO, currently pure diesel in tank.

Where I am now:
Glow plugs are not an issue at this point, as no fuel is getting to the injectors.
The lift pump is working.
Battery and starter are in good shape

What else can I do? I detest the thought of replaceing the IP, only to find out a line was clogged...
When I got the exact same car and same milage it was doing the same thing. Then when i was driving one day the car died and it turned out to be the fuel pump.

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 08:20 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