The tubing for the fuel pickups would probably be right about where you think the problem is.
Your best bet is going to be draining the tank, pulling it off, flipping it over and taking the fuel pump assembly out. You may want to get a fuel pump gasket and a couple of fuel pickup filter bags before you start.
Retired USAF, IYAAYAS!
2008 V-Star 1100 Custom Bobber project
2011 Crimson XR with Forged Highway Bars / Hard Bags / Passenger Backrest, Ness parts including Smooth Layback Plate Frame/Mount / Rad 3 Mirror / deep cut grips / drivers floorboards /shifter peg / brake peg / passenger pegs. Witchdoctor black rack, Lloydz filter / timing wheel / VFC III, 7Jurock windshield, Drag Specialties seat.