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Old 01-17-2020, 02:57 PM   #11
Aqua Puttana
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Default Re: 2003/612 alternative fuel filter interval?

From a somewhat parallel Coolio thread.

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... So i asked the question on another post of what should be the interval on the alternative fuel filter for the 612...20k seems to be the consensus but here we are...luckily i am a pro at swapping that thing now...Thanks Everybody!
Even a conservative fuel filter change interval won't completely avoid problems caused by contaminated or off grade fuel. A 20k mile filter change interval won't necessarily protect from a 12k mile early fuel filter loading up vs a 40k change interval.

It can be argued that a fresher filter has more tolerance, but your one off 12k filter change example would probably happen anyway, if it was plugged.

Can we be absolutely certain that it was a plugged filter, and not air in the system? Maybe the filter change changed sealing on the system? Might be worth cutting the filter open for visual inspection to provide another data point.

vic
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Old 01-17-2020, 04:15 PM   #12
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Default Re: 2003/612 alternative fuel filter interval?

On aircraft we occasionally deal with the same types of fuel contamination that diesel does. No matter how frequent the filter change interval, a single bad fuel event can clog the filter fast, sometimes in hours. For safety reasons aircraft have a fuel filter pressure bypass though.

Given that many people go 40-60k without changing their filter (not that I recommend it). The filter has plenty of capacity for the normal fuel contamination. But when the filtration systems on the fuel distribution system fail, it can overwhelm even a brand new filter quickly. For some contaminates it only takes 10-20 grams to render a filter too plugged to pass sufficient fuel, especially when cold.

Unlike previous diesel fuel systems, common rail systems circulate lots of fuel (gallons per minute) through the filter to cool the fuel components. The om647 can tolerate about 2-3 psi of pressure drop across the filter before issues can pop up. The 612 is lower IIRC, around 1-2 psi before the filter clog light comes on, and low rail pressure results under load.
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Last edited by Midwestdrifter; 01-17-2020 at 04:57 PM.
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Old 01-17-2020, 09:19 PM   #13
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Default Re: 2003/612 alternative fuel filter interval?

My 2008 clogged fuel filter experience: https://sprinter-source.com/forum/sh...&postcount=369
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Old 01-17-2020, 10:54 PM   #14
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Default Re: 2003/612 alternative fuel filter interval?

Interesting story. It seems that you ran into about as many unprofessional types as anyone could in one incident.

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...

So, as a tale often told and retold, for the lack of $20 preventive maintenance, it cost about $900 in rental cars, towing fees and parking. ...
What was your fuel filter change interval before your unfortunate travel experience? What is it now?

vic
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Old 01-21-2020, 01:47 AM   #15
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Default Re: 2003/612 alternative fuel filter interval?

The one thing that crossed my mind was that possibly the rail pressure needed to build back up after removing the fuel pressure regulator to swap the o rings. Then after the fuel filter swap and repriming that pressure was finally achieved. I do intend on cutting open the filter to take a look. I would love to know if the icarsoft MBII shows the fuel rail pressure for a 647!
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