Vapor lock in a fast climb to altitude is a common problem in TC'd aircraft and can even be a problem in high performance NA aircraft.  That's why we recommend turning on the boost pump in most of these applications as one passes through 10,000 feet in a climb.  We also recommend leaving the boost pump on for at least 30 min. after reaching cruise altitude so the fuel in the tanks can cool off and will no longer be subject to vapor lock.  Vapor lock essentially leans the mixture and will be noted by a rising EGT/TIT in the climb--even wit the mixture remaining full rich.