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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