All, This is my first post.  I'm a proud new owner of a 310i.  I purchased the plane on Monday with a fresh annual and during that service they replaced the left aux/boost fuel pump for the reasons of it clearing circuit breakers.  While flying back to VT I noticed the flow didn't increase when putting the left pump on, and the circuit breaker was popped.  One reset and the pump worked fine, but it cleared after landing with the pump on.  It pops after running for an extended period of time.   So... either the pump is still bad or there is something else wrong.  Any ideas folks?  Thank you!  -Kyle