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bugpartslou
Samba Member
Joined: March 29, 2003
Posts: 130
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 Posted: Mon Sep 07, 2009 3:17 pm Post subject: Anybody worked on 1970s Mercedes Mechanical Injection? |
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| Looking for someone local to help me figure out the injection on my 70 280SE 6 cylinder, this is a solid car that I don't want to give up on but the injection seems to be running rich and fouling the plugs out. I'm in Steger IL about 30 miles south of Chicago, also near Hammond, Gary, etc. |
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Tram
Samba Socialist
Joined: May 02, 2003
Posts: 22727
Location: Still Feelin' the Bern- Once you've felt it you can't un- feel it.
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| Posted: Mon Sep 07, 2009 3:41 pm Post subject: Re: Anybody worked on 1970s Mercedes Mechanical Injection? |
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| [email protected] wrote: |
| Looking for someone local to help me figure out the injection on my 70 280SE 6 cylinder, this is a solid car that I don't want to give up on but the injection seems to be running rich and fouling the plugs out. I'm in Steger IL about 30 miles south of Chicago, also near Hammond, Gary, etc. |
Just got done tearing apart, freeing up, and re- installing the injection pump on a 1964 230SL that has sat since 2000 with fuel in it.
First- check to see if your lift pump- the electric one back by the tank- gets hot and /or very noisy after having run awhile. It's very likely that pump is putting out very low volume, and low volume will mimic rich running because you need the high pressure atomization of the full prescribed volume of fuel to burn efficiently. In other words, instead of spraying, your injectors may be dribbling or just squirting a stream of fuel.
Those electric pumps cost a fortune. I've had great success in adapting a Vanagon or injected VW Bus electric injection pump in place of the OE. Lots of runability problems originate with the rear electric pump not pumping enough volume.
If you need service info on this PM me your Email address. I have all the factory manuals that cover tuning and adjusting these engines. I could scan what you need and pass it on.
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Немає виправдання для війни! Я з Україною.
| Bryan67 wrote: |
| Just my hands. And a little lube. No tools. |
To best contact me, please use the EMAIL function in my profile |
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67 Florida Deluxe
Samba Purist
Joined: June 21, 2005
Posts: 7987
Location: Gainesville and Tampa, Florida
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| Posted: Thu Sep 10, 2009 8:20 pm Post subject: |
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My '68 280 SE sat for a long time before I bought it, and had some fuel injection issues appear when I started driving it. I quickly realized that the fuel tank was rusted and falling apart inside, causing injection problems from the debris. Check your tank and be sure it's not in need of a cleaning and relining. Even if you get the fuel injection sorted out, you do not want to introduce any detritus into it from a funky tank. Also, (as I found out the hard way with my 6.3), NEVER let the car run out of fuel, or run with a low volume of fuel from the tank, say, from a clogged fuel tank outlet. It's a high speed/pressure fuel pump and without ample (or no) flow, the fuel pump impeller can seize up, and possibly burn up the fuel pump motor (as Tram stated). Those MB fuel pumps are very finicky and expensive!
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-Kent (BaT "daleallen")
OG member of the '67 Posse
A few of my toys, past and present
'56 Oval, '66 KG Conv't, '67 21-Window, '67 Bug, '79 SuperVert, '55 Pre-A Continental |
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Tram
Samba Socialist
Joined: May 02, 2003
Posts: 22727
Location: Still Feelin' the Bern- Once you've felt it you can't un- feel it.
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| Posted: Thu Sep 10, 2009 8:56 pm Post subject: |
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| 67 Florida Deluxe wrote: |
| My '68 280 SE sat for a long time before I bought it, and had some fuel injection issues appear when I started driving it. I quickly realized that the fuel tank was rusted and falling apart inside, causing injection problems from the debris. Check your tank and be sure it's not in need of a cleaning and relining. Even if you get the fuel injection sorted out, you do not want to introduce any detritus into it from a funky tank. Also, (as I found out the hard way with my 6.3), NEVER let the car run out of fuel, or run with a low volume of fuel from the tank, say, from a clogged fuel tank outlet. It's a high speed/pressure fuel pump and without ample (or no) flow, the fuel pump impeller can seize up, and possibly burn up the fuel pump motor (as Tram stated). Those MB fuel pumps are very finicky and expensive! |
What I've always done with my injected Benzes (and VWs, too) is to install a regular parts store filter in the gravity feed line from the tank to the electric pump. This way you'll catch the junk BEFORE it hits the electric pump. It doesn't have to be a high pressure filter if it's just in the line between the tank and the electric pump.
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Немає виправдання для війни! Я з Україною.
| Bryan67 wrote: |
| Just my hands. And a little lube. No tools. |
To best contact me, please use the EMAIL function in my profile |
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Yellowbeard
Samba Member
Joined: March 07, 2006
Posts: 2288
Location: At large again...
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| Posted: Fri Sep 11, 2009 5:56 am Post subject: |
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Tram's slipping. It took him 24 minutes to post up...
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| Lohe wrote: |
Thanks. Thread went from me not being able to understand what Ipis was saying because English is obviously not his first language to me not being able to understand it because English is my first language  |
Fuel pumps galore:
http://www.thesamba.com/vw/classifieds/detail.php?id=845378 |
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