Re: fuel line up against spark plug
Why not just use a longer fuel line and route it away from the plug. The shielded hose mentioned is probably not a good idea because the sheath is stainless steel, a conductor of electricity. You don't want spark jumping to it for obvious reasons.
Try rerouting the fuel line before shielding it from the plug. Maybe a 90 degree elbow at or near the tank petcock?
Age and Treachery Will Always Triumph
Over Youth and Skill & "Charlie Don't Ride"