That line is under pressure. Any air in the system can only get in through a leak in a negative pressure area of the system. I can think of only two ways.
First through a leak in a line that is always under "vacuum" - such as the suction line from the tank to the input of the hand pump on the side of the IP. Everything after that hand pump is under pressure. But this would produce bubbles all the time.
Second, through a leak in the (normally) pressurized side once the engine is shut down. When the engine is shut down, the normally pressurized part will eventually end up under vacuum as the fuel wants to flow downhill back to the tank through the return lines. Since the bubbles show up in the line from the large canister filter to the IP, The leak is likely between the output of the hand pump and the banjo bolt on the input rail of the IP. Do you by any chance see any fuel leaks in that part of the system when the engine is running?
Bogy.
--- On Wed, 6/20/12, Lawrence Rhodes <primobassoon@sbcglobal.net> wrote:
> From: Lawrence Rhodes <primobassoon@sbcglobal.net>
> Subject: [diesel_mercedes] air in the clear fuel line from the secondary filter to the injector pump.
> To: diesel_mercedes@yahoogroups.com
> Date: Wednesday, June 20, 2012, 3:03 PM
> I have a veggie conversion that after
> a day of sitting gets air in the clear
> top fuel line going from the banjo to the injector
> pump. Could return lines let
> the air in here? Is the banjo bad? My other
> veggie conversion is tight starts
> right up and doesn't do this. What am I missing?
>
>
>
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