2.5 Engine= JUNK!!!
FYI.............
Vapor lock is when the fuel in the line or delivery system boils and creates gas or "vapor" pockets in the delivery sytem which in turn starves the engine of fuel as they (the vapor pockets) enter the carb, causing it to stall. This will also cause hard restarting problems. Its not unusual to waste two battery packs on the Ol' EZ start trying to get it up and running again. The only way to prevent this is to route your fuel supply line away from the engine and always run it a bit rich. Running extra exhaust pressure line does nothing. The 2.5 is a VERY tempermental engine to tune and once it gets lean its real hard to reel it back in.