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There is a fuel filter design commonly used on commercial vehicles that is an inverted clear bubble with the filter element visible inside. You gauge the condition of your filter by how high on the element the fuel rises (there is a line on the filter element indicating the level when it needs changed). I illustrate this example becaues it would not be possible without some trapped air in the system.
That's a very good point.
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I believe the problem has more to do with quantity of air than anything else. Any air (pockets or bubbles) in the lines that migrate to the IP can cause performance issues and in some cases, pockets can be large enough to completely loose prime.
I'll just keep watch of how she's running then, and keep an eye on those lower connections as time goes on. Maybe bleed the lines every so often, and compare with the quantity I saw when I was having real troubles. I wonder too that if there was a leak of any size, then the air will collect (if not bled out) and will eventually get to the IP, so there's must be a tolerance for air to some degree before performance is affected. I'm sure that if it was a big deal, then the system design, or at least the quality of the connections, would be different, or it would be a common aftermarket issue. Thanks for the help.
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My GOD am I taking the side of the bean counters.
LOL