I believe I figured it out. I believe a lot of others figured it was it too but didn’t want to post it as a learning process. What I can tell you was the timing was odd when it happened.
I have 2005 international 9400i that Is giving me hell, the fuel tank on the passenger side stays full while the driver side is empty the gage reads full or 3/4 tank inside the truck. I don’t know how to equalize the full. There isn’t a crossover value so how can I fix this problem
if i remember right there are return lines to each tank, and no crossover tube. could try checking those.