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Old 11-16-2020, 08:54 AM
s2s s2s is offline
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Join Date: Jul 2020
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Pre Filter Air

1973 220d
Replaced the prefilter and there is an air bubble in it. Everything I have read on these forums say that is fine/normal and you can't get rid of it. But the car quit while driving and let me sit. Couldn't get the car restarted until I used a zip tie to pull the filter up so that the bubble went to the top/back and then rebleed the fuel system. See picture to see the bubble and the zip tie to my battery handle fix. Car runs great now and I guess I can just leave it zip tied to by battery permanently but just wondering why this happened, and what I did wrong, or why this caused me problems if it's normal. Did I not leave the line from the tank long enough and this caused the air bubble to float to the front of the filter?

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Pre Filter Air-air-filter.jpg  
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Old 11-16-2020, 09:24 AM
t walgamuth's Avatar
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Join Date: Apr 2005
Location: Lafayette Indiana
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I think your starting problem was due to an air pocket elsewhere. I'd check all my fuel lines and look for an air leak on the suction line.
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Old 11-16-2020, 06:47 PM
s2s s2s is offline
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Hmm... maybe, but I changed all the fuel lines when I changed the prefilter, and put several miles and starts on it before it started to lose power and eventually stalled. Then all I did was the zip tie and bled the main filter screw followed by the injector lines and it has run perfectly ever since. Even if I did have a leak in one of the newly replaced lines it would have caused the issue again.
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Old 11-17-2020, 12:47 AM
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Perhaps an air bubble worked its way to an injector tube. Once there, it might keep the injector from popping, though likely will eventually get dissolved into the fuel to pass thru the injector. But, it would probably have to happen in 3 of the 4 injector lines to kill the engine. Anyway, your bleeding air out at the top of each injector fixed it.

I changed the pre-filter in my 1984 300D a few weeks ago since the hose was slightly kinked and I wanted to change to bio-fuel rated hose. Surprisingly, after using the hand pump to circulate fuel back to the tank, I wound up with no air bubble in the pre-filter. Seems like I always saw a bubble like your photo before. I didn't even bother cracking the banjo fitting at the main fuel filter while pumping, nor the injector tubes, and the engine fired right up and ran fine.

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