I experienced this on an '07 1600, never did figure it out. I swapped fuel pumps, ECU, and spark plugs, all to no avail. Troubleshooting suggestions from various forums included the coils, and possibly the EFI wires where they connect to the cylinders. Someone suggested they'd got kinked and shorted out once the bike warmed up. I was roughly 75K miles into that motor at the time.
I couldn't figure it out and it was really messing with vacation, so I parked the bike in '15, and have it awaiting a full work-through some winter. That happened when I was in the middle of my annual Sturgis migration, a (then new) Indian was already planned for, so I picked one up and have been enjoying it every since.
No idea as to what's inside the tank, I haven't seen anything like it during my disassembly. The pump and filter are a single unit, with nothing else in there.
I couldn't figure it out and it was really messing with vacation, so I parked the bike in '15, and have it awaiting a full work-through some winter. That happened when I was in the middle of my annual Sturgis migration, a (then new) Indian was already planned for, so I picked one up and have been enjoying it every since.
No idea as to what's inside the tank, I haven't seen anything like it during my disassembly. The pump and filter are a single unit, with nothing else in there.
