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  1. M

    Gen 5 Merc 454 and 502 MPI, VST and Vapor Lock issues...without cool fuel

    An old subject, but one I?ve toiled over for a couple of months now. Vapor Lock!! Or is it? I?ve logged hours pouring over forum posts (many on this web-site), visiting with Merc Technicians, performance boat guys and even speaking with Mercury Technical Support on a couple of occasions. Not...
  2. M

    Gen 5 454Mag MPI stalling on plane

    Recently purchased boat with the 454Mag MPI, 385 h.p. I've had many problems with what i always thought was fuel delivery. After reading many posts on here I alleviated many fuel and electronic components. And yes, it does have that nauti VST. Having said that, I am not convinced it is my...
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