1972 280se 4.5 - Mercedes-Benz Forum

 
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post #1 of 9 (permalink) Old 02-05-2010, 05:42 AM Thread Starter
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1972 280se 4.5

Hey guys! Well I'm back, and this time I have money again to put into my ride. So I already installed a new silinoid on the starter, and a fuel pump. It cranks over and that part of it sounds strong and healthy, but its like its missing something. My question is this, what part in this particular model is in charge of powering the electrical system (which is supposed to send fuel thru the lines, im not getting fuel past the motor, but its pumping up to it) I am buying an owners manual today, but just thought I would get a headstart. I appreciate any feed back! Thanks again! Could it be a certain fuse block? OR?

Billy Benz
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post #2 of 9 (permalink) Old 02-05-2010, 06:14 AM
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Could be ECU fuse issue, trigger points in distributor, check wiring harness below dist. cap. Injectors bad. Have you pulled the injector rail and verified no fuel? Check this for detailed troubleshootiong
D Jetronic
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post #3 of 9 (permalink) Old 02-05-2010, 01:05 PM
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Start with the ignition sytem. Verify you have spark to the plugs. The most important parts of running the car are the ECU, the fuel pump and associated relays. All the other sensors can be unplugged, and the engine will still run (but poorly). I'd doubt that the trigger points are bad - those rarely fail.

Take a look at the online resources portion of the forum - lots of stuff has been posted there on your car.

Cheers!
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post #4 of 9 (permalink) Old 02-15-2010, 01:40 PM Thread Starter
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Thanks guys, your advice is greatly appreciated.
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post #5 of 9 (permalink) Old 02-16-2010, 01:42 PM
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That particular model has a power supply wire at the battery positive post attached to the main positive cable end. That wire is the primary power feed for the fuel injection system. from there there are two relays attached to the panel behind the computer in the engine compartment. One runs the FI system and maybe the other runs the fuel pump, not altogether sure as to the fuel pump relay. check the power supply wire at the battery first.
Bill
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post #6 of 9 (permalink) Old 02-23-2010, 02:32 PM Thread Starter
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Bill- thanks for your advice! Ironically enough, my roommate and I have done just that, but I didnt know about the primary battery wire either. So, I opend up both the relays and they looked burnt up? I believe that is our issue, but I am going to check the battery supply first, thanks again Bill!
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post #7 of 9 (permalink) Old 02-25-2010, 07:40 PM
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Fuel pump relay is underneath the ecu. You can hear it come on for 2 seconds when you turn the key. Replace burnt relays with nice new clean working relays. Then car will start.
Maybe
On ECU
The ground of the ECU is terminal 11 verify that with battery ground, chassis.
Check voltage at 24 and 16 with key on. These are your main relay power to ecu connections. Should be 12 volts. Injectors are powered by ECU, if your not getting voltage at these terminals, you got bad main relay or who knows what.
You got these links right

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http://members.rennlist.com/pbanders/djetfund.htm

Last edited by marcedesbenz; 03-01-2010 at 06:36 AM.
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post #8 of 9 (permalink) Old 03-22-2010, 01:12 PM Thread Starter
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Hey thanks again!! You've been a great help, sorry I just saw this post (you can ignore the other) Hav a good day, and thanks for helping this young, unexperienced Benz owner advice haha
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post #9 of 9 (permalink) Old 03-22-2010, 01:17 PM Thread Starter
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I'm looking to buy the relays that are just left of the battery, and it was my understanding that they look identical to the fuel pump relays, but are multi purpose relays. Ironically, I remember seeing them on a website at PelicanParts.com, and then when I get the money, I couldnt find them. When I start the car, my roomate and I could hear the relays click, but not all of them..
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