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-   -   Why Different Amounts of Air in Primary Fuel Filters? (http://www.peachparts.com/shopforum/showthread.php?t=285971)

shertex 10-04-2010 04:45 PM
Why Different Amounts of Air in Primary Fuel Filters?
 
I suppose the only downside to owning two (almost) identical cars is that I notice every difference, so I start wondering...

In one car (91 300D), the amount of air in the primary fuel filter is negligible....maybe a half inch if the filter were turned vertically.

In the other car (92 300D), I would say the amount of air is about 1/3 the volume of the filter.

Both cars fun flawlessly.

Why the difference in the size of the air pockets?

I guess this is how I amuse myself when both cars are working perfectly!:D

Brian Carlton 10-04-2010 05:58 PM
What was the fuel tank level in each vehicle at the time of the observation?

shertex 10-04-2010 06:04 PM
Quote:
Originally Posted by Brian Carlton (Post 2558215)
What was the fuel tank level in each vehicle at the time of the observation?
Yes.

Brian Carlton 10-04-2010 06:15 PM
Quote:
Originally Posted by shertex (Post 2558221)
Yes.
You sound like Roy now..........:D

shertex 10-04-2010 06:17 PM
Quote:
Originally Posted by Brian Carlton (Post 2558229)
You sound like Roy now..........:D
Why? Is he known for terse answers?

Local2ED 10-04-2010 06:29 PM
Quote:
Originally Posted by shertex (Post 2558178)
I suppose the only downside to owning two (almost) identical cars is that I notice every difference, so I start wondering...

In one car (91 300D), the amount of air in the primary fuel filter is negligible....maybe a half inch if the filter were turned vertically.

In the other car (92 300D), I would say the amount of air is about 1/3 the volume of the filter.

Both cars fun flawlessly.

Why the difference in the size of the air pockets?

I guess this is how I amuse myself when both cars are working perfectly!:D
I don't have an answer but I've noticed the same thing on a 93 300D. When I change filters the air bubble is different. I just attributed it to different brands of filters although I don't know why it would be different.

Brian Carlton 10-04-2010 06:50 PM
Quote:
Originally Posted by shertex (Post 2558230)
Why? Is he known for terse answers?
He evades the question............:D

snookwhaler 10-04-2010 07:20 PM
Quote:
Originally Posted by Brian Carlton (Post 2558215)
What was the fuel tank level in each vehicle at the time of the observation?
Does it matter? Does it change?

Curious...

Mine always has a small bubble in it and it is always around the same size. I'm so anal about it that I mark the side of the filter with a sharpie (along with the date and mileage), so I can see if the bubble size ever changes... But it never does in mine.

clackclack 10-04-2010 08:34 PM
Mine had about half
 
Mine was about half air and it was throbbing at idle. I back blew the fuel hose and it stays completely full now.


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