Weak/dying fuel pump! EFI 460's are NOTORIOUS for this problem, not a matter of if, but when the original pump fails! Vapor lock next to impossible, fuel injection operates at too high a pressure for that. Depending on your tank size (35 gal?)you may be able to do what some have done on Class A's with 460's, and always run the fuel tank on the upper half of the gauge, so the fuel doesn't get the chance to heat up too much. Regardless, plan on replacing the pump sooner rather than later. If having a shop do the replacement, be sure and have them clean out the tank! Good luck
