bridge out an ML270CDI fuel pre-heater? - Mercedes-Benz Forum

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post #1 of 3 (permalink) Old 12-27-2009, 03:19 AM Thread Starter
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Vehicle: W123 300D 1981; W163 ML270CDI 2002; w463 G300D 1994
Location: Noordhoek, South Africa
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bridge out an ML270CDI fuel pre-heater?

Hi there

Does anyone know if there will be any adverse effects if I bypass the diesel pre-heater? The elbow on my ML270CDI has cracked on the intake side. I have managed to perform a temporary fix by repairing it with pratleys quick steel. If it cracks off again can I bypass it and feed the "cold" fuel straight into the outlet pipe (pipe goes into the Bosch injection rail)? I am in the middle of nowhere and can't get a replacement part straight away. Anyone know if driving for prolonged periods can do any damage if I bridge it out?

Surely the diesel is cold on startup until the radiator is hot enough to heat the diesel anyhow? Bearing in mind I am in South Africa and current temperatures are about 35 degrees C and going to get hotter as I am on my way to Namibia.

Any help would be much appreciated.


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post #2 of 3 (permalink) Old 12-27-2009, 05:01 AM
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You must mean the fuel cooler? CDI engines need a fuel cooler at the return line to keep the fuel cool enough for the tank. At some testing a plastic fuel tank melted from the fuel heat. A CDI high pressure pump heats up the fuel a lot, could be specifically an issue at your place but also at cooler places.
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post #3 of 3 (permalink) Old 12-27-2009, 12:02 PM
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Rare engine, so hopefully you will find a member with direct experience, but to my knowledge any bypass will trigger an error. Even you can ignore the error it will become annoying over the time, so you will want to fix it right sooner or later.
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