What's this electrical thing attached to Inline Injection Pump? - Mercedes-Benz Forum

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post #1 of 3 (permalink) Old 06-27-2011, 01:08 PM Thread Starter
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What's this electrical thing attached to Inline Injection Pump?

Hi I'm a newbie in the forum with an old Merc diesel. I've always been impressed how these keep on going year after year. The vehicle has always been a plodder, not very fast but always gets there whatever the weather.

Well up until a week ago anyway. She just refused to start. There's no fuel coming through to the injectors.

Is there a Diesel / electrical guru here who can identify what this thing does on the side of the Inline Injection Pump? There's some pictures attached.

I've ruled out the vacuum operated engine shut down device, it's not that. It seems like it's this electrical device with wires that's preventing starting. I have a hunch it's an immobilizer of some kind?

You can see a hexagon head bold attached to it, that's not standard. This is a long story, but in a nutshell a year ago the engine was replaced - which came complete with another injection pump. We had to salvage this electrical device from the old injection pump, because the new engine wouldn't start until this device from the old engine was present. Hence the hex bolt attached, because the retaining bolt was 'headless' - as a security measure to make it difficult to remove. Anyway that all happened a year ago, and the engine has been good as gold all this time.
The only issue over the last month or so is the yellow heater light taking longer to turn off, it never affected starting at all. I put that down to a blown glowplug. Can rule out glow plugs anyway because no fuel coming through, and the engine 'runs' and warms up while test spraying brake cleaner into air intake.

So what's this electrical device with all the wires for?
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post #2 of 3 (permalink) Old 06-28-2011, 02:59 AM
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The bolt in the pic is not supposed to be there I believe, a bit of a diy mod.



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post #3 of 3 (permalink) Old 07-01-2011, 01:50 PM Thread Starter
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I showed these pictures to my local Bosch Service centre and they told me everything I wanted to know and vehicle is running fine now

Originally Posted by eric242340 View Post
The bolt in the pic is not supposed to be there I believe, a bit of a diy mod.
well of course it's a diy mod, that's what I'd said in the 1st posting if you read it.

Last edited by dieselnutter; 07-01-2011 at 02:03 PM.
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