I once installed a longer hose for the fuel line to make draining easier.
Well, my first interstate ride the bike died about 5 miles from home. Pulled over, looked things over, etc. Bike fires up. I headed home via local roads.
I pulled the fuel filter and ran without that next. Bike dies almost exact same spot on interstate. I was like WTF, looking around for overhead electrical interferance, UFO's, heck, that was wierd. After a few minutes bike fired up. Went home via local roads.
Bottom line - I had tucked the extra hose behind the cylinders and it was probably boiling the fuel and causing vapor-lock. Once I shortened the hose to stock length, no problems ever since.