There is no reason to insulate any fuel lines if they are of original design and routed as originally designed. Vapor lock from hot fuel lines in these trucks is a myth.
If underhood temperatures become hot enough to boil the fuel, you would not be able to put your hand on the fuel lines.
If the underhood temperatures ever do reach those temperatures, you have a much more serious engine problem than what would be caused by a bad coil or a faulty fuel delivery system.
Once again, don't do anything to the truck until it dies again, and then immediately test for spark.
Get back to us after that. We can then move on to the next step.
I am attempting to save you a lot of unnecessary work, as well as prevent you from complicating the diagnostics by throwing parts at the engine.
Last edited by 52Carl; 07/18/2023 4:59 AM.
