450SEL fuel pump question - Mercedes-Benz Forum

LinkBack Thread Tools Display Modes
post #1 of 3 (permalink) Old 05-07-2004, 09:47 PM Thread Starter
BenzWorld Veteran
w108's Avatar
Date registered: Apr 2004
Vehicle: None
Location: Edmonton, Alberta & San Tan Valley, Arizona
Posts: 738
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
(Thread Starter)
450SEL fuel pump question

On these vehicles, should you be able to hear the fuel pump running when you turn the key to the "on" position? My "new" old 450 does not make any fuel pump noise, further it has a hard time starting regarless of it being cold or hot which I think may be the pump's fuse burnt out or the pump being spent. It does start eventually because of the vacuum drawing fuel up eventually...

Any thoughts?

w108 is offline  
Sponsored Links
post #2 of 3 (permalink) Old 05-06-2005, 10:02 AM
BenzWorld Newbie
Date registered: May 2005
Vehicle: 1974 Mercedes 450SL, 1975 Rolls Royce Silver Shadow
Location: Ireland
Posts: 4
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Send a message via AIM to dawood
RE: 450SEL fuel pump question

Yes, you'll hear it some on and whirr for a few seconds while it primes the engine.
dawood is offline  
post #3 of 3 (permalink) Old 05-11-2005, 06:52 PM
BenzWorld Junior Member
Date registered: Apr 2005
Posts: 6
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
RE: 450SEL fuel pump question

HI. My 450SEL has not had made noise or ticking from the fuel pump in 7 the years I have had it.

However starting is instantanious with a reasonably charged battery, diffult with a smaller than standard or undercharged battery. Mine would churn away for 10 or 20 seconds before starting until I decided to charge the battery fully, then it became instantanious. I finally put in a full sized heavy duty battery, and lately I use a trickle chrager ( I only use it once a month) and no more starting delays.

Incidently, the fuel injection can only work from the high pressure pump. The vacuum will not suck fuel through the injection system as it will through a carburettor.
John Skene is offline  
Sponsored Links

  Mercedes-Benz Forum > General Mercedes-Benz Forums > Vintage Mercedes-Benz

Quick Reply

Register Now

In order to be able to post messages on the Mercedes-Benz Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Posting Rules  
You may post new threads
You may 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 Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Title goes here

video goes here
description goes here. Read Full Story
For the best viewing experience please update your browser to Google Chrome