3406B running out of fuel

I've got a 93 Pete 379 w a B model. Has run like a champ for the Last 6 months. Had a fuel tank that developed a hole so I swapped tanks. Ran fine for half a day and now it's running itself out of fuel. The secondary filter is bone dry. I pulled the line loose and blew back into the tanks seems clear. I don't understand how it can run with that filter being empty.

 

Crossover line. I turned the new tank off thinking that would help and no luck.

 

Putting a new fuel line on her now. Let's keep our fingers crossed!

 

Put a new fuel line on. Helped a little bit. 2nd filter is getting a little fuel now. Put a ful pressure gauge on it where the filter monitor gauge hooks up and its holding a constant 40 psi. Hooked the gauge back up and it's still not acting like it did. You can hear fuel dripping back into the tank when you kill it. Is that normal?