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 > Vintage Mercedes Forum

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 05-13-2011, 02:00 PM
Registered User
 
Join Date: Apr 2011
Location: Dunlap IL
Posts: 166
fuel gauge issues

my 79 240d fuel gauge worked great when I drug the car home.

I removed the tank and cleaned everything out. But ever since the gauge doesn't work.

I removed the sender cylindar again and cleaned it very well with brake parts cleaner. I made sure to get lots of the solvant inside the cyl so it could brake up the gunk inside.

When I put it back in the gauge lifted from the dead bottom to the 'R' - still showing empty. The tank is full - or nearly so - I just filled it up.

What are the common trouble shooting things I need to look at? Is there a ground I forgot I removed?

did the cleaner kill the sender?

Reply With Quote
  #2  
Old 05-13-2011, 02:17 PM
Registered User
 
Join Date: Apr 2011
Location: Dunlap IL
Posts: 166
I did a search and found the link.

When I cleaned it - I didn't know I could pull the cyl apart and clean it from there. I will do that tonight & see if I have it back online.
Reply With Quote
  #3  
Old 05-13-2011, 02:17 PM
Stretch's Avatar
...like a shield of steel
 
Join Date: Sep 2009
Location: Somewhere in the Netherlands
Posts: 14,461
Did you take it apart as shown here?

http://www.peachparts.com/Wikka/W123FuelSender

Or did you just dip it in a tub of brake cleaner?

When I took mine apart I found there was loads of gunk in there that would in no way be shifted by brake cleaner through the little holes...

W123 300D Fuel tank sender question





But that is nothing compared with post #22 in the same thread!
__________________
1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!
Reply With Quote
  #4  
Old 05-13-2011, 02:18 PM
Stretch's Avatar
...like a shield of steel
 
Join Date: Sep 2009
Location: Somewhere in the Netherlands
Posts: 14,461
Quote:
Originally Posted by BrassMonkey View Post
I did a search and found the link.

When I cleaned it - I didn't know I could pull the cyl apart and clean it from there. I will do that tonight & see if I have it back online.
Ha you beat me to it!
__________________
1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!
Reply With Quote
  #5  
Old 05-13-2011, 04:21 PM
Registered User
 
Join Date: Apr 2011
Location: Dunlap IL
Posts: 166
That's because I'm as fast as my 240D!
Reply With Quote
  #6  
Old 05-14-2011, 10:08 AM
meltedpanda's Avatar
Certified Benzaholic
 
Join Date: Mar 2003
Location: Central Ky
Posts: 6,240
the thin wires break, or the slider malfunctions, difficult to fix, if you have some nichrome wire you can try, mine worked after my fix but only so so
__________________
Ron
2011 Porsche Cayman - Bond,James Bond
Sadly MERCEDESLESS - ALways LOOKING !
99 E320 THE Queen Mary - SOLD
62 220b - Dolly - Finally my Finny! Sadly SOLD
72 450SL, Pearl-SOLD
16 F350 6.7 Diesel -THOR
19 BMW X5 - Heaven on Wheels
14 38HP John Deere 3038E Tractor -Mean Green
84 300SD, Benjamin -SOLD
71 220 - W115-Libby ( my first love) -SOLD
73 280 - W114 "Organspende" Rest in Peace
81 380 SL - Rest in Peace
Reply With Quote
  #7  
Old 05-14-2011, 04:10 PM
Registered User
 
Join Date: Apr 2011
Location: Dunlap IL
Posts: 166
I got it apart. 1 of the 3 wires is broken. But it isnt one of the two the float rides on. The rod the float slides up and down is/was very nasty and rusty. It took quite a bit of emery paper to get it cleaned. The float does slide easily up and down now.

I re-installed and it goes to about 1/3 tank. I'm hoping it will go down as the fuel level goes below 1/3. If it is accurate for that last third I'll probably leave it.

If not - I'll order a new one.
Reply With Quote
  #8  
Old 05-14-2011, 05:13 PM
Stretch's Avatar
...like a shield of steel
 
Join Date: Sep 2009
Location: Somewhere in the Netherlands
Posts: 14,461
Quote:
Originally Posted by BrassMonkey View Post
I got it apart. 1 of the 3 wires is broken. But it isnt one of the two the float rides on. The rod the float slides up and down is/was very nasty and rusty. It took quite a bit of emery paper to get it cleaned. The float does slide easily up and down now.

I re-installed and it goes to about 1/3 tank. I'm hoping it will go down as the fuel level goes below 1/3. If it is accurate for that last third I'll probably leave it.

If not - I'll order a new one.
Ummm sorry to bring bad news - they're not cheap - about 300 euros last time I looked I think. Look for a second hand one.
__________________
1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!
Reply With Quote
  #9  
Old 05-14-2011, 06:29 PM
Registered User
 
Join Date: Apr 2011
Location: Dunlap IL
Posts: 166
ouch! - I will be trying to repair the wire in this one then. It doesn't look that hard. Solder a new strand in at the top and wrap it around the bottom & repeat. Of course it alwasy sounds easier than it really is.
Reply With Quote
  #10  
Old 05-14-2011, 07:02 PM
Yak Yak is offline
Registered User
 
Join Date: Aug 2009
Location: San Antonio, TX
Posts: 1,711
I believe the third wire is for the low light, not the fuel level.

I'd recommend doing a search for a pick-n-pull; or post on the parts forum for a WTB.
Reply With Quote
  #11  
Old 05-14-2011, 10:02 PM
meltedpanda's Avatar
Certified Benzaholic
 
Join Date: Mar 2003
Location: Central Ky
Posts: 6,240
as mentioned not any wire will do
look here
Anyone ever rebuild a gas gauge sending unit W114/W115
__________________
Ron
2011 Porsche Cayman - Bond,James Bond
Sadly MERCEDESLESS - ALways LOOKING !
99 E320 THE Queen Mary - SOLD
62 220b - Dolly - Finally my Finny! Sadly SOLD
72 450SL, Pearl-SOLD
16 F350 6.7 Diesel -THOR
19 BMW X5 - Heaven on Wheels
14 38HP John Deere 3038E Tractor -Mean Green
84 300SD, Benjamin -SOLD
71 220 - W115-Libby ( my first love) -SOLD
73 280 - W114 "Organspende" Rest in Peace
81 380 SL - Rest in Peace
Reply With Quote
  #12  
Old 05-14-2011, 10:44 PM
Registered User
 
Join Date: Apr 2011
Location: Dunlap IL
Posts: 166
interesting - I had thought about pulling a strand of wire from an old cord or somthing. But if its just the low fuel light - I'm golden. so long as the gauge reads the bottom 1/3 of the tank.

I would prefer it float to the top - but beggers cant be choosers.
Reply With Quote
  #13  
Old 05-15-2011, 11:51 AM
Yak Yak is offline
Registered User
 
Join Date: Aug 2009
Location: San Antonio, TX
Posts: 1,711
The service manual says the gauge/cluster design changed in '82 to include a test of the low light function in position I of the ignition.

If your low light doesn't light up at all, that might mean it's above the limit, or might mean the wire's broken. Later clusters would show the light on start up.

If you get a reading, then the float might be okay. Having a two gallon fuel can in the trunk might be prudent though.

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 - 2023, 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