Ever since I put the Langdon exhaust on the Suburban, I've experienced "vapor lock" symptoms whenever I drive more than 5 or 10 minutes. I finally broke down and wrapped the front exhaust pipe near the fuel pump today. I also wrapped the fuel line on the advice of one of my co-workers (he's a flattie Dodge army truck guy). Getting ready to go for a drive and see if this solves the problem. Was going to go up to Redwwod City and do some other work on her at the shop, but I spent so much time wrapping the pipe & lines I decided to pass on that. Maybe a good test would be to go over to In N Out Burger (you get In line N you never get Out). If she starts up after that eternity I'll know I have the problem solved.