I haven't had this Willys but a little over a year now. Among a lot of annoying issues I'm sorting out, vapor lock is one of them. This vehicle is a M38 with a 225 and a Holley 390 which I can't seem to recall the model off the top of my head right now. It has an electric fuel pump to the rear of the vehicle I will be installing a new radiator, shroud and possibly electric fans shortly (it over heats at idle) and relocating the fuel filter and Holley pressure regulator which is currently bolted to the intake manifold and getting heat soaked badly. I'm also installing a pressure gauge on the opposite end of the pressure regulator to verify I have sufficient pressure from the pump. I keep hearing that I need to have a return fuel line to help keep cool fuel circulating. I've tried and tried to find pics and diagrams showing the return and how it should be hooked up in the engine compartment area, but can't find anything that I think applies. I did find a return fuel line going back to my under seat tank, but the other end is connected to the carb at where I think is normally suppose to be the charcoal canister port connection. I would think a return connection should be as close to the carb as possible (but not connected to the carb) and have a much smaller return line so that the pump doesn't run full bore and still keep enough pressure to supply the carb. What am I missing and am I over thinking this? BTW, I log in almost every single day to read the latest info and going on's even though I don't respond much. So I just want to say THANKS, I appreciate all the generous knowledge you all give out so graciously every day.