Terry,


There have been a lot of posts on this in the past; and, you can likely dredge them up with the search function.


A couple things to start, assuming a person is already flying wings level:


1) Check the fuel cap pitots - they should both be pointed directly ahead - if not, remove the caps from the tanks and bend them to where they are supposed to be. While you are at it - look for a plugged or partially obstructed pitot.



2) Be sure the fuel cap seals are actually sealing - if one is not, this can bleed off the slight positive pressure from the fuel cap pitot.


3) After that, might be time to look at the fuel lines from both tanks to be sure they are routed and clear as designed.






Cheers,