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Old 12-01-2014, 12:19 AM
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Join Date: Nov 2013
Posts: 47
kind words please

What might be easy for some is being difficult for me.
Om617 primary fuel filter has a bubble in the middle I can't get out.
Is there a trick to getting it out? The filter looks to almost run dry when engine is running higher rpm's

Yes the search box can also help though I'm down to a smartphone which the search box will close when trying to use.
Thank you in advance
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Old 12-01-2014, 01:15 AM
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You mean the clear pre filter? Pump the hand primer pump. If that dont work, loosen the injector lines to the injectors push accelerator pedal down and crank the engine over. bleed the air out that way.
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Old 12-01-2014, 02:48 AM
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Ok, Thanks for reply. Yes clear filter.
With engine running?
It runs now but can't seem to get air bubble out.
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Old 12-01-2014, 09:21 AM
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Originally Posted by adreamin View Post
Ok, Thanks for reply. Yes clear filter.
With engine running?
It runs now but can't seem to get air bubble out.
Prime the primer pump with the engine off.

Once, when changing filters on my 123 240D, I clipped clamps on the hoses on each side of the filer.

I connected the new filter to the side coming from the tank, then took a ketchup squeeze bottle with diesel in it and filled the filter. I held it up and connected to the other side (toward the engine). After connecting, three or four priming hits on the priming pump took care of everything.
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Old 12-01-2014, 10:09 AM
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Thanks, going to try that, do have a electric pump hooked too, thought that would push it through but it didn't.

Last edited by adreamin; 12-01-2014 at 10:25 AM.
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Old 12-01-2014, 06:28 PM
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Location: Pollock, LA
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The top 1/4 of mine is almost always an air bubble. I don't worry about it. It has never been a problem. But it doesn't almost empty either when accelerating.

You can also install a hand squeeze bulb pump in the line if your pre-filter is before your lift pump. That way, you can loosen the clamp and pump it full.
1991 350SDL 350k+ miles
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Old 12-02-2014, 09:17 AM
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That bubble is always there unless you rotate the filter. Nothing to worry about.
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Old 12-04-2014, 10:56 AM
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Try to replace the hose before and after the filter. I suspect there is air beeing sucked in.

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