Can't keep fuel equal in tanks.

[snailexpress]

I spent 2 days searching for Cummins document i had read 5-6 years ago about fuel system. Unfortunately didn't find it yet. The document says - fuel return lines should be below fuel level in fuel tank. So, stand pipes must be in both tanks. Once fuel system is primed and air purged the fuel will stay in system unless you have air intrusion in some place. Than fuel will drain back into tank and air get in the system. Submerged return lines works as equalizing device and to prevent fuel aeration. Return fuel will flow into tank with lower level. When engine is off return lines interconnection works as siphon to transfer fuel in lower tank.
Will continue to search for you.