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 > Tech Help

Reply
 
LinkBack Thread Tools Display Modes
  #16  
Old 04-16-2021, 02:35 PM
ajschank's Avatar
Registered User
 
Join Date: Jun 2019
Location: Grand Rapids, Michigan
Posts: 33
Jumpered the pins, same outcome. I have previously replaced both pumps and the fuel filter, so I would like to think those are a solid constant here. When I got it only one fuel pump was working intermittently. It did burn up a fuel pump relay before I swapped the pumps, but I had an extra fuel pump relay and it has seemed okay thus far.

Reply With Quote
  #17  
Old 04-16-2021, 04:18 PM
Registered User
 
Join Date: Feb 2011
Location: Modesto CA
Posts: 3,334
ajs:

Barring a problem with the ECU itself, the symptoms, taken all together suggest a mechanical problem rather than an electrical one. The fuel system can be viewed as composed of two components: fuel supply, and fuel metering.
The supply component includes the tank, hose to the fuel pumps, pumps, accumulator, filter, piping from filter to the fuel distributor, the pressure regulator, and the return piping.
The metering component includes the fuel distributor & air flow meter, the injection valves & lines, and the ECU & EHA.

Things are getting a bit obscure here, but an extended fuel flow test with the pump relay jumpered (10-15 mins.?) might reveal a time dependent fault in the supply. A battery charger hooked up may be required to keep the pumps running.
Have you run with the pressure regulator leak line disconnected?
Reply With Quote
  #18  
Old 04-16-2021, 06:22 PM
ajschank's Avatar
Registered User
 
Join Date: Jun 2019
Location: Grand Rapids, Michigan
Posts: 33
Quote:
Originally Posted by Frank Reiner View Post
ajs:

Barring a problem with the ECU itself, the symptoms, taken all together suggest a mechanical problem rather than an electrical one. The fuel system can be viewed as composed of two components: fuel supply, and fuel metering.
The supply component includes the tank, hose to the fuel pumps, pumps, accumulator, filter, piping from filter to the fuel distributor, the pressure regulator, and the return piping.
The metering component includes the fuel distributor & air flow meter, the injection valves & lines, and the ECU & EHA.

Things are getting a bit obscure here, but an extended fuel flow test with the pump relay jumpered (10-15 mins.?) might reveal a time dependent fault in the supply. A battery charger hooked up may be required to keep the pumps running.
Have you run with the pressure regulator leak line disconnected?
I will give the extended fuel test a go and monitor it to see if it gets weird after some time. I have not run with the return line off. I will try that first with the return in a clear jug or something.
Reply With Quote
  #19  
Old 04-16-2021, 07:20 PM
Registered User
 
Join Date: Feb 2011
Location: Modesto CA
Posts: 3,334
Quote:
Originally Posted by Frank Reiner View Post
Have you run with the pressure regulator leak line disconnected?
Quote:
Originally Posted by ajschank View Post
I will give the extended fuel test a go and monitor it to see if it gets weird after some time. I have not run with the return line off. I will try that first with the return in a clear jug or something.
In the event that I was not clear, I was referring to the small push-on vent line on the fuel pressure regulator, not the return line to the tank.
Reply With Quote
  #20  
Old 04-16-2021, 08:07 PM
ajschank's Avatar
Registered User
 
Join Date: Jun 2019
Location: Grand Rapids, Michigan
Posts: 33
Quote:
Originally Posted by Frank Reiner View Post
In the event that I was not clear, I was referring to the small push-on vent line on the fuel pressure regulator, not the return line to the tank.
Ohh got it. Yes Iíve run with it connected and disconnected, doesnít seem to change anything. Hereís another video of what it does just in case your eyes see anything like donít (or ears for that matter). https://youtube.com/shorts/QVd2GtiCe5Y?feature=share
Reply With Quote
  #21  
Old 04-18-2021, 09:16 PM
Registered User
 
Join Date: Feb 2007
Location: los angeles
Posts: 737
i had a ce300 act like that, it was the eha, once warm bogged, lack of power , when cold ran ok untill it started to warm up, eha is suspect with your description
Reply With Quote
  #22  
Old 04-19-2021, 11:40 AM
ajschank's Avatar
Registered User
 
Join Date: Jun 2019
Location: Grand Rapids, Michigan
Posts: 33
Quote:
Originally Posted by nulu View Post
i had a ce300 act like that, it was the eha, once warm bogged, lack of power , when cold ran ok untill it started to warm up, eha is suspect with your description
Iíve got a few spare on my workbench, Iíll give one I believe is a good one a go, and report back. Will probably do the extended flow test suggested by Frank while in the area. Appreciate all the thoughts so far!
Reply With Quote
  #23  
Old 04-20-2021, 07:52 AM
ajschank's Avatar
Registered User
 
Join Date: Jun 2019
Location: Grand Rapids, Michigan
Posts: 33
Alright swapped to my known good EHA, and the car acted about the same. It almost seemed as if it was happening sooner than normal, but still the same symptoms. Also preformed flow test, happily flowed fuel for about 10 minutes. I took a look in the ECU to see if anything looked off. Nothing obvious, some brown looking staining on some of the pins that connect the top portion of the pcb to the lower pcb

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 10:18 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2021, 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