Fuel system leaking down

[coalminer16]

My 81 rabbit with AAZ transplant engine and a newer style fuel filter with a CAT filter (seen on tdi engines). I recently started to have an issue where the fuel seems to leak down and get air into the filter area. I have a hand primer bulb online before the filter and once I pump it things stay fine until it sits again for a couple days. If I run without repumping the hand bulb it barely runs and will die and not have power. Once I pump all is fine. Where do I start? No external leaks at all.

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[coalminer16]

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[RunninWild]

How is the gasket on the return line going into the filter? Can get some leaks there when they get old.

[coalminer16]

I did just replace it but it looked good. I decided to change the the filter and orings.

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[fatmobile]

 Clear line coming from the pump will let you know if air is leaking in around the small injector lines.
 I see air at the filter output. Any air at the front of the pump?

[92EcoDiesel Jetta]

On the bottom of the banjo, I see 2 copper washers stacked against each other. That is not normal practice and could be where air is getting in.

[RunninWild]

I also just noticed the hose coming from the hand pump to the filter is a larger diameter then the filter nipple. That might be your issue? Maybe try running it without the hand pump and a proper diameter hose? or try replacing the hoses coming from the hard lines under the car to the filter?