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
  #1  
Old 07-26-2011, 05:39 PM
Registered User
 
Join Date: Jan 2010
Location: U.S.A
Posts: 347
1989 300ce fuel pump fuse?

hi,i know i have a fuel pump relay located behind my battery,does anyone know if there is a fuel pump fuse on this car? both pumps have lost voltage,if all else fails i will replace the puel pump relay,thanks.

__________________
enjoy life,take the coal that is handed to you and turn it into diamonds. { PHILLIPIANS 4:13}
Reply With Quote
  #2  
Old 07-27-2011, 08:19 AM
Moderator
 
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
No fuse, only the relay. Have you tried removing the relay & jumping the pins to run the pumps?
__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator
Reply With Quote
  #3  
Old 07-27-2011, 09:21 AM
RBYCC's Avatar
Registered User
 
Join Date: Mar 2007
Location: DELAWARE
Posts: 1,041
Quote:
Originally Posted by mbdoc View Post
No fuse, only the relay. Have you tried removing the relay & jumping the pins to run the pumps?
What about the fuse(s) on the top of the OVP?
No speed signal and no power to the pumps.
Engine will crank but not start.
__________________
http://i19.photobucket.com/albums/b1...c/GOWIDE-1.jpg
1971 280SL ROADSTER
1988 300CE TWIN TURBO WIDEBODY
1994 E320 CABRIOLET
1999 C43 AMG
2005 G55K AMG
2008 CLK63 AMG BLACK SERIES
Reply With Quote
  #4  
Old 07-27-2011, 11:07 AM
ps2cho's Avatar
Registered User
 
Join Date: Jun 2006
Location: Chandler, Arizona
Posts: 3,523
Jump pins 87 and 15, then turn ignition on and listen for pumps spinning.
__________________
2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k
Reply With Quote
  #5  
Old 07-27-2011, 05:08 PM
Registered User
 
Join Date: Jan 2010
Location: U.S.A
Posts: 347
thankyou all for your input,my diag so far consits of,running a positive jumper to 1 fuel pump,it operates with ignition off,i have checked both fuses on top of ovp both fine,someone told my check fuse number 7,all underhood fuses fine,i also removed fuel pump relay,and ran the jumper wire,pump still operates with relay removed,i would guess the negative wires are chassis grounded to both fuel pumps,pumps operate with jumper and engine ckranks and runs with the jumper wire,im still diaging,not sure if its heading to be a defective relay tower,i will also check the pin numbers suggested,thanks
__________________
enjoy life,take the coal that is handed to you and turn it into diamonds. { PHILLIPIANS 4:13}
Reply With Quote
  #6  
Old 07-28-2011, 01:55 PM
Registered User
 
Join Date: Jan 2010
Location: U.S.A
Posts: 347
ok i replaced the fuel pump relay with a new spare i had found,pumps still do not operate,pins 87 and 15 are they in the connector end? i will now check them for a bad or broken end,does anyone know if the drivers passlock has anything to do with security system shutting power to fuel pumps? ive had issues in the past with the security system.another question is it possible the ignition switch controls power to fuel pumps?
__________________
enjoy life,take the coal that is handed to you and turn it into diamonds. { PHILLIPIANS 4:13}
Reply With Quote
  #7  
Old 07-28-2011, 09:36 PM
Registered User
 
Join Date: Feb 2007
Location: los angeles
Posts: 683
I had a similiar problem on a 560sl, the ignition ezl , sends a voltage to the fuel pump relay and then the relay in turn will keep pumps running after cranking and running, after i diagnosed that, a good ezl ignition allowed power to the pumps, you need to get the wiring diagram for your car and see if thats the issue, in your case if you jumpered the fuel pumps at relay and the pumps run the car should start, if it starts jumpered but not with relay plugged in you need more testing, hope that helps

Last edited by nulu; 07-29-2011 at 10:15 PM.
Reply With Quote
  #8  
Old 07-29-2011, 04:30 PM
Registered User
 
Join Date: Jan 2010
Location: U.S.A
Posts: 347
thanks for more input, that ezl ignition on the drivers inner fender has been in the back of my mind.
__________________
enjoy life,take the coal that is handed to you and turn it into diamonds. { PHILLIPIANS 4:13}
Reply With Quote
  #9  
Old 07-29-2011, 10:41 PM
Registered User
 
Join Date: Jun 2011
Posts: 50
Good fuses on top of the OVP does not confirm that the OVP is good; you may want to replace it if you do not know for certain that it is good or if you do not know when it was last replaced.

See attached wiring diagram that does indeed show fuse 7 involved. Lots of components, connectors, wires and grounds to rule out in this circuit. Good luck.
Attached Thumbnails
1989 300ce fuel pump fuse?-fuel-delivery-86_89.jpg   1989 300ce fuel pump fuse?-electronic-engine-controls-88_89.jpg  
Attached Files
File Type: pdf fuel delivery 86 thru 89.pdf (157.4 KB, 783 views)
File Type: pdf Electronic Engine Controls 88_89.pdf (205.2 KB, 640 views)

Last edited by cbc atl; 07-29-2011 at 11:39 PM.
Reply With Quote
  #10  
Old 07-31-2011, 01:40 PM
Registered User
 
Join Date: Feb 2007
Location: los angeles
Posts: 683
In my case it was the t-d signal being lost to f/p relay intermittantly, had a volt meter hooked up and if my memory serves correct had maybe 9 volts and anything under car would die, 2nd voltmeter hooked up to fuel pumps verified power was getting shut off.replaced ezl and everthing good.

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 07:34 PM.


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