Need Help Fuel Issue - Mercedes-Benz Forum

 
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post #1 of 9 (permalink) Old 03-04-2014, 01:41 PM Thread Starter
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Need Help Fuel Issue

I have a fuel issue in my 1970 280 SEL. It turns on and idles fine and after you put in gear it runs for 2 - 3 minutes and dies. I have replaced the fuel pump and fuel filter 2x.
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post #2 of 9 (permalink) Old 03-04-2014, 02:08 PM
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EDIT: Oops. Sorry. I assumed the first injection system was the Bosch D-jet. Still learning.

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post #3 of 9 (permalink) Old 03-04-2014, 02:28 PM
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Is it an injected fuel system or carburated? I had a similar issue but mine has the two zenith carbs.
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post #4 of 9 (permalink) Old 03-04-2014, 05:39 PM
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If 280sel, fuel injected, no carb no d jet tonic then
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post #5 of 9 (permalink) Old 03-04-2014, 07:01 PM Thread Starter
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injected
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post #6 of 9 (permalink) Old 03-05-2014, 01:26 AM
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Quote:
Originally Posted by Baybear View Post
If 280sel, fuel injected, no carb no d jet tonic then
baybear

That sure is cryptic. Edit, Ahh... Now that I see there was another injection system prior to the D-jetronic, I see this makes sense.

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post #7 of 9 (permalink) Old 03-05-2014, 11:57 AM
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Does it tend to die more when the fuel is below 1/4 tank or less? Does it die but you can restart almost immediately but will then die again? I've become the evangelist for telling people they should always remove, inspect and clean or replace the fuel strainer that is in the fuel tank accessible from the plug beneath. This clogs and is not part of the typical "change the filters" service. It's a fairly cheap part and common for hard to diagnose fuel issues.

There are other possibilities but this is pretty typical unless you know your fuel tank has been cleaned and recoated recently, in which case this would have been attended to.

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post #8 of 9 (permalink) Old 03-08-2014, 07:46 AM
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Yeah, I'm with DirectLA on this one. That strainer cleaning can make a huge difference
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post #9 of 9 (permalink) Old 03-09-2014, 04:48 PM
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before replacing anything , try figuring what is going on .in this case , get a gauge that reads up to 30 psi or so [ hardware store ], a fitting that screw into that gauge to put a piece of gas hose , connect it at the fuel line at the cold start valve [ unplug it ] with rubber hose and a clamp . fuel pressure should be about 10 psi .the car will run on a low side , like 2 or 3 . start car and let it run , and see , pressure should not move .if it slowly goes to zero , and engine quit , problem will be at tank .i would also replace the fuse for the pump .
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