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 12-19-2012, 06:37 PM
Ron in SC's Avatar
Registered User
 
Join Date: Aug 2003
Location: Charleston, SC
Posts: 1,095
Car will not start, wait 2 hour and it will; what's going on

1992 300 TE

Car will not start when it is not driven for a few days.
Here's what happens:
-battery will crank engine but engine will not start.
-no fuel when I check spark plugs
-no fuel when I crack gas line going to fuel distributor.
**wait a few hours maybe 2 hours, go out car will starat no problem.

What might be going on, anyone have this happen?

Only thing I could think of is fuel pump and check valve attache thereto.

I do hear the pump making sound for a few seconds when I turn key but not all the way.

Reply With Quote
  #2  
Old 12-19-2012, 09:25 PM
Registered User
 
Join Date: Feb 2011
Location: Modesto CA
Posts: 3,246
1. Try cycling the fuel pump 3, 4, 5 times by turning the key to "on" (but not start), letting the pump run until it shuts off, then again, and again. If there is a defective accumulator, fuel pressure will bleed off over a long period of inactivity. Repeated pump cycling may bring up enough pressure to start.
2. The inlet screen in the fuel distributor (FD) may be almost clogged. When you make an attempt to start, enough fuel pressure may be built up to eventually fill the FD, so that it will start after a 2 hr. wait.
Reply With Quote
  #3  
Old 12-19-2012, 11:43 PM
Registered User
 
Join Date: Aug 2012
Location: Trevose, PA
Posts: 90
Fuel Pump Relay. It's right behind the battery where a plastic cover resides. If it's the fuel pump relay, there should be pressure going to the fuel distributor after cycling the key a few times. STRONG pressure.
__________________
97 W202
Reply With Quote
  #4  
Old 12-19-2012, 11:56 PM
Registered User
 
Join Date: May 2004
Location: Natchez MS and Dallas TX
Posts: 355
Quote:
Originally Posted by pinkfloydfan810 View Post
Fuel Pump Relay. It's right behind the battery where a plastic cover resides. If it's the fuel pump relay, there should be pressure going to the fuel distributor after cycling the key a few times. STRONG pressure.
Not trying to be a smartass but if the relay is bad there will not be pressure by cycling the key. The pump relay is designed to only pump for a few seconds if the engine is not running. That's why with a good relay you can build pressure by cycling the key even though the engine doesn't start.
__________________
85 300 SD ~ 115K
82 500 SEC Euro ??K
78 450SL 164K
Reply With Quote
  #5  
Old 12-20-2012, 09:35 AM
Ron in SC's Avatar
Registered User
 
Join Date: Aug 2003
Location: Charleston, SC
Posts: 1,095
Quote:
Originally Posted by Frank Reiner View Post
1. Try cycling the fuel pump 3, 4, 5 times by turning the key to "on" (but not start), letting the pump run until it shuts off, then again, and again. If there is a defective accumulator, fuel pressure will bleed off over a long period of inactivity. Repeated pump cycling may bring up enough pressure to start.
2. The inlet screen in the fuel distributor (FD) may be almost clogged. When you make an attempt to start, enough fuel pressure may be built up to eventually fill the FD, so that it will start after a 2 hr. wait.
I have previously tried the repeated cycling which did not help.

I will check the inlet screen in the fuel FD when I find it's location.
Reply With Quote
  #6  
Old 12-20-2012, 01:34 PM
Registered User
 
Join Date: Aug 2012
Location: Trevose, PA
Posts: 90
Quote:
Originally Posted by jimandsuzy View Post
Not trying to be a smartass but if the relay is bad there will not be pressure by cycling the key. The pump relay is designed to only pump for a few seconds if the engine is not running. That's why with a good relay you can build pressure by cycling the key even though the engine doesn't start.
I meant to say if the pump relay is replaced with a good unit, the key should be cycled at least once then check the line at the fuel distributor and close the line and crank. Close the line first then crank. Fuel should spew out but be sure to put something under the line. It most likely IS the fuel pump relay.
__________________
97 W202
Reply With Quote
  #7  
Old 12-20-2012, 04:00 PM
Registered User
 
Join Date: Apr 2005
Location: Chicago
Posts: 325
I dunno that model (or relay) specifically, but I DO know that on another car we had, the relay had 2 "stages" one to prime the line before starting (or build pressure or whatever), and another to run the pump after ignition and the car was running. The prob we had (If I recall correctly) was that our car would crank and crank and not start, then it would start and run fine. Then the next time we tried it- it would crank and crank again. So if it was me, I might take a look at the relay as previously discussed.
Reply With Quote
  #8  
Old 12-20-2012, 09:52 PM
Registered User
 
Join Date: Aug 2012
Location: Trevose, PA
Posts: 90
I found genuine MB fuel pump relays on eBay $40.00 free shipping from California.
eBay Fuel Pump Relay Link $40.00
__________________
97 W202
Reply With Quote
  #9  
Old 12-21-2012, 10:24 AM
is thinning the herd
 
Join Date: Mar 2010
Location: Columbus, Ohio
Posts: 3,340
Check the inlet screen first as its free to clean it.


My 190E quit running the other day and cleaning the inlet screen with brake cleaner got it running again in under 5 minutes.

Two big lines that at 17mm iirc go into the fuel distributor. On an m102 its the line closer to the fire wall. Take the line off the fuel distributor. You will see a fitting still in the fuel distributor that is the same size, take it out. It should have a tiny little conical screen in it. Blow some air and or brake cleaner through it from both directions.

If the fitting you pull out doesn't have a screen in it, you've got the wrong side. Just pull out the other fitting.
__________________
68 280SL - 70 280SL - 70 300SEL 3.5 - 72 350SL - 72 280SEL 4.5 - 72 220 - 72 220D - 73 450SL - 84 230GE - 87 200TD - 90 190E 2.0 - 03 G500

Nissan GTR - Nissan Skyline GTS25T - Toyota GTFour - Rover Mini - Toyota Land Cruiser HJ60 - Cadillac Eldorado - BMW E30 - BMW 135i
Reply With Quote
  #10  
Old 12-21-2012, 05:13 PM
thayer's Avatar
Mercerator
 
Join Date: Oct 2008
Location: Mt. Airy, NC
Posts: 891
Pull your current relay and check for corrosion on the posts. My OVP in my e320 caused the same symptoms you are describing. I bought a new ovp but its still in the box as cleaning the old relay with a wire brush did the trick.
__________________

77' 300D, "Cartman" SOLD @ 150K (didn't know what I had)
83' 300SD, "The Superdon" 325k+ @ 28mpg
95 E320 wagon, "Millennium Falcon" 231k+ @ 24 Mpg
95 E300D, "Sherley" 308k @ 33.69 Mpg, currently anticipating a head
99 Suzuki Intruder "Trudy" @ 45 mpg
Reply With Quote
  #11  
Old 12-22-2012, 08:20 AM
Ron in SC's Avatar
Registered User
 
Join Date: Aug 2003
Location: Charleston, SC
Posts: 1,095
Thanks for all the help.

Based on the advice I replaced the OVP with a spare. I cleaned the little filter at the fuel distributor with brake clean and then blew it out with compressed air.

After doing this I reassembled and turned the key and the car started right away. I know there was previously no pressure in system because it bled off when I accessed the fuel distributor.

Hopeful this will fix the problem. Really the only way to know is let it sit for 5 or so days and then try to start.
Reply With Quote
  #12  
Old 12-22-2012, 03:05 PM
MBeige's Avatar
Registered User
 
Join Date: Apr 2005
Location: SoCal
Posts: 3,746
Also check (and replace if needed) fuel pressure accumulator. It's responsible for maintaining fuel pressure when engine is off. If it's bad, it shows symptoms similar to what you're having, due to loss of fuel pressure in system.
Reply With Quote
  #13  
Old 12-22-2012, 04:19 PM
Registered User
 
Join Date: Feb 2011
Location: Modesto CA
Posts: 3,246
Re: Accumulator

Please see post #2.
Reply With Quote
  #14  
Old 01-12-2013, 02:37 PM
Ron in SC's Avatar
Registered User
 
Join Date: Aug 2003
Location: Charleston, SC
Posts: 1,095
Now the situation is the car will not start at all.

Battery will crank starter.

Fuel will get to distributor from fuel pumps.

Fuel will not get to spark plugs, they are completely dry.

Now what?
Reply With Quote
  #15  
Old 01-12-2013, 03:24 PM
slk230red's Avatar
WECO Installer
 
Join Date: Jul 2006
Location: Tampa, FL
Posts: 819
Quote:
Originally Posted by Ron in SC View Post
Now the situation is the car will not start at all.

Battery will crank starter.

Fuel will get to distributor from fuel pumps.

Fuel will not get to spark plugs, they are completely dry.

Now what?
Check to make sure the plunger in the Fuel Distributor isn't stuck. Remove the air cleaner and check the travel of the round plate.

__________________

1993 190E 2.3
2001 SLK230
1971 LS5 (454) Corvette Convertible
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 03:36 AM.


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