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A ha !  That green air line is the vent for the tank. It has a loop in it to prevent siphoning. And I can tell you that if you pinch it when reinstalling the tank, that pretty soon the engine will not crank because of the vacuum on the tank. I have data on that situation.

Just a dumb suggestion, because you don’t have very much at risk. If you forced mineral spirits or Seafoam down the line from the tank end is there a possibility it would dissolve the gunk in the check valve?

And while you have the fuel line disconnected at the bung, blow some air into the pickup to make sure it bubbles. I don’t think you have a broken pickup like I did, but it’s a very quick sanity check.

Thank you for helping another Newell owner on this.

So the plot thickens, there is a green vent line but there is another larger green line connected to the tank, also appears it has a check valve on it, guessing it’s a 1/2” green line, that is the one I am talking about. The green vent line just goes across the top of the tank to the other side with the loop on it you are talking about. 

Cleaning the check valve could be a possibility but we also figure the line is not in good shape so either way it has to be replaced and currently the old line is now stuck where it will not pull in either direction. I think Ole was going to try to see if he could free the old line. 

The pickup line is fine, when I put pressure on the tank with the vacuum the fuel flows out of the 90 degree fitting on the top of the tank really good. A couple seconds with the vacuum turned on and a good puddle of diesel on the top of the tank. 

Thanks for all the good suggestions, the more brains the better. I also had my buddy there to give us some good suggestions, which we implemented while we were there. He gets me out of a jam sometimes and I do the same for him. He also is my parts supplier, has been in the diesel truck business for over 40 years, so his knowledge and contacts are invaluable.