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 > Tech Help

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 10-31-2001, 11:42 AM
csx27
Guest
 
Posts: n/a
Question Replacing the Fuel Pump on a 420 SEL 1986

Can anyone tell me how to replace a fuel pump on a 420 Sel (1986) ? Is there or are there any special things that I need to look out for. Please dont tell me it is in the tank! Help!
Reply With Quote
  #2  
Old 10-31-2001, 12:04 PM
Registered User
 
Join Date: Jan 2000
Location: PA
Posts: 5,440
Its been too long since I replaced one for me to give you specific info. But as I remember it was straight forward. The one I did (300SEL6.3) was next to the tank, not inside.

Putting the pump in the tank is the most hairbrained thing I ever heard of. Don't the people who do dimwitted things like putting the pump in the tank realize how much shops charge an hour and because of stupid designs take 5 times a long to fix? It the car manufactyres had to pay the repair costs, which usually are beyond the warranty, maybe they would design for easy serviceability.

When I worked for IBM, reliability and serviceability was always a design criteria. Since many of IBM's machines were rentals, it was to IBM's advantage to have the fewest breakdowns and when they did happen, the machines had to bequick, easy and economical to repair. Not so with the car companies.

~~~~~~~~~~~~~~~~~PEH~~~~~~~~~~~~~~~
Reply With Quote
  #3  
Old 10-31-2001, 03:57 PM
MIKE FREEMAN
Guest
 
Posts: n/a
YOUR FUEL PUMP PACKAGE IS UNDER THE CAR AHEAD OF THE RIGHT REAR AXLE (PARTIALLY COVERED BY PLASTIC COVER).
YOUR 420 HAS TWO FUEL PUMPS AND DETERMINING WHICH ONE IS BAD CAN BE TOUGH,USUALLY THE LOUDEST ONE IS BAD.
SIMPLE TOOLS ARE REQUIRED(PHILLIPS SCREWDRIVER,7MM AND 8MM WRENCH,TWO 17MM WRENCHES AND 10MM SOCKET ON LONG EXTENSION.
KEEP A FIRE EXTINGUISHER NEARBY AND NEVER USE A DROPLIGHT AROUND GASOLINE
MF
Reply With Quote
  #4  
Old 10-31-2001, 05:45 PM
csx27
Guest
 
Posts: n/a
Thanls that really helped a lot...Everything is in a nice neat package (pumps, filter) and it does not look as bad as I thought...Will work on it tonight and keep you updated. Again, thanks a lot.
Reply With Quote
  #5  
Old 11-05-2001, 05:48 PM
moedip
Guest
 
Posts: n/a
Just did my 560 SEL

Just changed my 2 fuel pumps, fuel filter and bracket that holds all of them together. The pumps, connecting lines, and filter were corroded so bad it was unbelievable. So was the bracket. When you change the pumps and/or fuel filter - there is a plastic sleeve that goes on each one to insulate them from the bracket and they are supplied with the new parts. MAKE SURE YOU PUT THEM IN. Someone had worked on this package before I got my car and all the corrosion was due to electrical reaction (I believe my mechanic said Galvanic reaction) between the aluminum filter and pumps and the steel bracket. He also told me the plastic insulators are there the prevent this. Make sure they are installed correctly!! Other than that - it's really a very easy job. Even though the connecting lines were convoluted, God bless Mecedes, they go together beautifully when properly aligned. No bending a little to make fit like some North American Cars.
Reply With Quote
  #6  
Old 11-06-2001, 10:21 AM
Registered User
 
Join Date: Jan 2000
Location: PA
Posts: 5,440
Just wondering why there are 2 fuel pumps on a MB 420???? I have a 300SEL6.3 and that can burn 20 gallons per hour at top speed and that only needed one fuel pump to supply all that fuel. ~~~~~~~~~~~~~~~~~~~~PEH~~~~~~~~~~~~~~~~~~~
Reply With Quote
  #7  
Old 11-06-2001, 11:07 AM
moedip
Guest
 
Posts: n/a
Why 2 pumps

Not knowing for sure - but using common sense -since the pumps are hooked up in series - I believe it is to get the proper pressure to the fuel distributor.
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


Similar Threads
Thread Thread Starter Forum Replies Last Post
We often overlook Fuel Pump damage--Low Sulfur Fuels and bad fuel (85 300D) Carrameow Diesel Discussion 16 11-15-2007 06:43 AM
DIY Notes may help people: Radiator, Fan Clutch, Temp Sensors, Fuel Pump, Temp Gauge ericgr SL Forum 3 09-24-2004 02:40 AM
Fuel Line Pressure on 420 SEL Cigar Havana Tech Help 1 09-14-2004 01:17 AM
How to rebuild Air Pump - 1989 420 SEL Cigar Havana Tech Help 3 02-16-2004 01:43 AM
fuel pump location on a 1986 300e mercedes benz miqueas55 Tech Help 0 06-22-2003 06:24 PM



All times are GMT -4. The time now is 06:21 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, 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