Air is or is NOT okay in fuel lines?
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From: So Cal
2009 c300
Air is or is NOT okay in fuel lines?
I have what I consider a large amount of air in my fuel lines. 2 seperate mechanics have told me "this is normal" - true? I have replaced all the clear lines and orings, also the fuel shut off was leaking - replaced entire unit. Car runs good, just wondering if air is sign of something bad???
Thread Starter
Junior Member
Joined: Mar 2007
Posts: 53
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From: So Cal
2009 c300
Sorry - 1999 e300td
The air is while running - the fuel in the clear lines ( all of them ) almost,but not quite, looks like foam. That's how many bubbles. It looks to be 30-40% bubbles. Seems like a lot to me. But like I said, car idles and runs great.
The air is while running - the fuel in the clear lines ( all of them ) almost,but not quite, looks like foam. That's how many bubbles. It looks to be 30-40% bubbles. Seems like a lot to me. But like I said, car idles and runs great.
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2006 E320 CDi, 2008 3/4 Ton Suburban, 2007 "rice rickshaw" Accord 5 speed
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The only problem was a noisy turbo when it starts spinning.
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2009 c300
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Junior Member
Joined: Mar 2007
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From: So Cal
2009 c300
$10 fix
Well ya'll - $10 fixed everything. I changed the fuel filter and pre-filter, and still had all kinds of air in the lines. Grrrrrr. I had just had my fuel lines changed, what else could it be. I looked at my fuel line and 2 of them did not look like they had been changed. I changed the one from the heater(?) to the prefilter. When I took it off there was NO O-RING on one of the sides!!! Uhh, maybe that was it? Clicked my new $10 line on, and started her up. Runs like a champ and NO air in the lines. 
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E-ZGO 53hp., 1999 E 430 sport, 2004 E 55, 2008 Tahoe LTZ on 24"s
I have what I consider a large amount of air in my fuel lines. 2 seperate mechanics have told me "this is normal" - true? I have replaced all the clear lines and orings, also the fuel shut off was leaking - replaced entire unit. Car runs good, just wondering if air is sign of something bad???
You should have zero air!
One bubble is too much!
Any body that tells you differently is wrong.
